Arc'teryx Dually Belay Parka Review: A long gone belay parka

This article is revised after Arc'teryx FW24 update.

Gift Guide: https://arcteryx.com/us/en/giftguide/

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Dually Belay (Men's) can be a great choice for stationary use out in temperatures down to 0 deg F (-18 deg C). Bonus: It doesn't lose its insulating capability under wet conditions, unlike down insulated jackets.

#Note: Find full Arc'teryx review list at the bottom.

Summary

Dually Belay Parka is the warmest synthetic insulated piece in the Arc'teryx line-up. It's also the 3rd warmest in Arc'teryx's entire insulated jacket family (excluding this monster from Arc'teryx LEAF, as its "too technical").

Dually Belay is also my top Arc'teryx pick for extreme colds, as you can see here: https://outdoorcrunch.com/best-arcteryx-jacket/

Warmth

First thing you should know about Dually Belay is that it's stupid warm.

It's equipped with ThermaTek (exclusive to Arc'teryx), which provides a superior insulation capability than other insulation filaments such as the Coreloft.

Temperature ratings of Arc'teryx jackets

Name	Est. Temp (F/C)	Review	Type	Fill Power (in3/oz)	Fill Weight (g)	Fill Volume (in3)	Synthetic Fill	Synth. Fill Weight	Face Fabric	Pit venting?	Two way zipper?	Stuffs into itself?	Activity	Fit	Weight	Length (CB)	Discontinued?
Arc'teryx Alpha (Men's - Women's)	-18/-28	Review	Down	850	296	8,875	Coreloft	90 g/m²	N30r 2L GoreTex Infinium	No	Yes	Yes	Climbing	Regular	805 g / 1 lb 12.4 oz	86 cm / 34 in	No
Feathered Friends Khumbu	-17/-27		Down	900	378	12,000	Primaloft Gold	200 g	Pretex Shield XT	No	No	Yes	All Round	Regular	960 g / 2 lb 2 oz	?	No
Arc'teryx Ceres SV (Men's - Women's)	-15/-26	Review	Down	850	240	7,196	Coreloft	?	Arato 30	No	Yes	Yes	All Round	Regular	880 g / 1 lb 15 oz	86 cm / 34 in	Yes
Mountain Equipment K7 (Men's)	-13/-25		Down	800	300	8,466	N/A	N/A	30D Drilite	No	Yes	Yes	All Round	Regular	820 g / 1 lb 13 oz	76 cm / 30 in	No
Rab Positron Pro (Men's)	-13/-25		Down	800	300	8,466	N/A	N/A	40D Pertex Quantum Pro	No	Yes	Yes	All Round	Regular	740 g / 1 lb 10 oz	85 cm / 33.5 in	No
Arc'teryx Therme SV (Men's)	-11/-24	Review	Parka	750	211	5,582	Coreloft	60 g/m²	2L Gore-Tex	No	Yes	No	Around Town	Regular	1.072 kg / 2 lb 5.8 oz	96 cm / 37.75 in	No
Patagonia Grade VII	-11/-24		Down	800	335	9,453	N/A	N/A	1.2 oz 15 & 20D Pertex Quantum	No	Yes	No	Around Town	Regular	743 g / 1 lb 10.1 oz	83 cm / 32.5 in	Yes
Patagonia AlpLoft (Men's - Women's)	-10/-23		Down	800	295	8,325	N/A	N/A	Pertex Quantom	No	Yes	Yes	All Round	Regular	680 g / 1 lb 8 oz	81 cm / 31.8 in	No
Arc'teryx Firebee AR (Men's - Women's)	-10/-23	Review	Down	800	225	6,349	N/A	N/A	Arato 7 & 10	No	Yes	Yes	All Round	Regular	680 g / 1 lb 8 oz	79 cm / 31 in	Yes
Mountain Equipment Exo (Men's)	-10/-23		Down	800	265	7,478	N/A	N/A	Nylon	No	Yes	Yes	All Round	Regular	770 g / 1 lb 11.2 oz	79 cm / 31 in	No
Arc'teryx Thorsen (Men's)	-7/-22	Review	Parka	750	192	5,079	Coreloft	60 g/m²	90D 2L Gore-Tex	No	Yes	No	Around Town	Regular	1.1 kg / 2 lb 5.4 oz	91 cm / 36 in	Yes
Patagonia Frozen Range (Men's - Women's)	-6/-21	Review	Parka	700	268	6,617	N/A	N/A	4 oz 75-denier polyester	No	No	No	Around Town	Regular	1.253 kg / 2 lb 12.2 oz	84 cm / 33 in	Yes
Mountain Equipment Li. Ec. (Men's - Women's)	-5/-20		Down	700	295	7,284	N/A	N/A	50D Drilite	No	Yes	No	All Round	Regular	822 g / 1 lb 13 oz	72 cm / 28 in	Yes
Arc'teryx Thorium Parka (Women's)	-2/-19	Review	Down	750	209	5,529	Coreloft	80 + 140 g/m²	Arato 20	No	Yes	No	Around Town	Regular	610 g / 1 lb 5.5 oz	115.8 cm / 45.6 in	No
Rab Neutrino Pro (Men's - Women's)	-2/-19		Down	800	212	5,982	N/A	N/A	20D Pertex Quantum Pro	No	Yes	Yes	All Round	Regular	585 g / 1 lb 8.6 oz	77 cm / 30.3 in	No
Arc'teryx Patera Long (Women's)	0/-18		Parka	750	204	5,397	Coreloft	60 + 80 g/m²	2L Gore-Tex	No	Yes	No	Around Town	Regular	1.1 kg / 2 lb 6.8 oz	117.5 cm / 46.25 in	No
Patagonia Stormshadow (Men's)	0/-18		Parka	700	259	6,395	N/A	N/A	75D Polyester	No	No	No	Around Town	Regular	1.182 kg / 2 lb 9.7 oz	?	No
Arc'teryx Beta Down Insulated (Men's)	0/-18		Parka	850	126	3,778	Coreloft	80 g/m²	2L 40D Gore-Tex	Yes	Yes	No	All Round	Regular	760 g / 1 lb 10.8 oz	79 cm / 31 in	No
Arc'teryx Dually Belay (Men's)	0/-18	Review	Synthetic	N/A	N/A	N/A	ThermaTek	92 g/m²	30D Nylon	No	Yes	Yes	Around Town	Regular	705 g / 1 lb 9 oz	84 cm / 33 in	Yes
Arc'teryx Centrale (Women's)	0/-18	Review	Parka	750	157	4,154	Coreloft	60 g/m²	N90p Nylon	No	Yes	No	Around Town	Regular	885 g / 1 lb 15.2 oz	95 cm / 37.5 in	Yes
Arc'teryx Thorium SV Parka (Men's)	0/-18		Down	750	195	5,159	Coreloft	80 + 140 g/m²	Arato 30 & 2L Gore-Tex Infinium	No	Yes	No	Around Town	Regular	685 g / 1 lb 8.2 oz	85 cm / 33.5 in	No
Arc'teryx Camosun (Men's)	0/-18	Review	Parka	750	105	2,778	Coreloft	140 g/m²	N150p-X Gore-Tex	No	No	No	Around Town	Trim	960 g / 2 lb 1.9 oz	80 cm / 31.5 in	Yes
Arc'teryx Cerium SV (Men's - Women's)	0/-18	Review	Down	850	162	4,857	Coreloft	80 + 140 g/m²	Arato 7 & 10	No	No	Yes	All Round	Regular	415 g / 14.6 oz	69.5 cm / 27.4 in	Yes
Arc'teryx Liatris Parka (Women's)	2/-17		Parka	850	136	4,078	Climashield	80 g/m2 + 60 g/m2	70D 3L Gore-Tex	No	No	No	Around Town	Regular	1.093 kg / 2 lb 6.6 oz	109 cm / 43 in	No
Arc'teryx Revet (Men's)	2/-17		Parka	750	?	N/A	N/A	N/A	20d nylon/spandex double weave	No	Yes	No	Around Town	Regular	755 g / 1 lb 10.6 oz	91 cm / 36 in	Yes
Arc'teryx Thorium SV (Men's)	3/-16		Down	750	169	4,471	Coreloft	80 + 140 g/m²	Arato 30 & 2L Gore-Tex Infinium	No	Yes	Yes	Around Town	Regular	645 g / 1 lb 6.8 oz	73 cm / 28.75 in	No
Arc'teryx Piedmont (Men's)	3/-16		Parka	750	218	5,767	N/A	N/A	Arato 10	No	Yes	Yes	Around Town	Regular	515 g / 1 lb 2.2 oz	82 cm / 32.25 in	Yes
Outdoor Research Sup. Alp. (Men's - Women's)	3/-16		Down	800	182	5,136	N/A	N/A	30D Pertex Quantum Pro	No	Yes	No	All Round	Regular	825 g / 1 lb 13.1 oz	85 cm / 33.5 in	No
Arc'teryx Fission SV (Men's - Women's)	3/-16	Review	Synthetic	N/A	N/A	N/A	Coreloft Continuous	90 + 65 g/m²	N80p-X Gore-Tex 2L	No	Yes	No	All Round	Regular	890 g / 1 lb 15.4 oz	81 cm / 31.8 in	Yes
Arc'teryx Alessa Long	3/-16		Parka	N/A	N/A	N/A	Coreloft	80 + 120 g/m²	N90p 2L Gore-Tex	No	No	No	Around Town	Regular	1.015 kg / 2 lb 3.8 oz	123 cm / 48.5 in	Yes
Arc'teryx Radsten Parka (Men's)	3/-16		Parka	N/A	N/A	N/A	Coreloft Compact	120 g/m²	NP100d Gore-Tex 2L	No	No	No	Around Town	Regular	745 g / 1 lb 10.3 oz	82 cm / 32.25 in	Yes
Rab Electron Pro (Men's - Women's)	5/-15		Down	800	180	5,079	N/A	N/A	20D Pertex Quantum Pro	No	Yes	Yes	All Round	Regular	525 g / 1 lb 2.5 oz	74 cm / 29 in	No
Rab Infinity Alpine (Men's)	5/-15		Down	800	175	4,938	N/A	N/A	30D & 13D Gore-Tex Infinium	No	Yes	Yes	All Round	Regular	551 g / 1 lb 3.4 oz	76.5 cm / 30.1 in	No
Arc'teryx Alpha Lightweight (Men's - Women's)	5/-15		Down	850	117	3,508	Coreloft Compact	40 g/m²	Hadron 2L Gore-Tex Infinium	No	Yes	Yes	Climbing	Regular	540 g / 1 lb 3 oz	79.5 cm / 31.25 in	No
Arc'teryx Therme Parka (Men's)	5/-15	Review	Parka	750	120	3,175	Coreloft	60 + 80 g/m²	P75d Polyester	No	Yes	No	Around Town	Regular	991 g / 2 lb 3 oz	85 cm / 33.5 in	No
Arc'teryx Liatris (Women's)	5/-15		Parka	850	93	2,788	Climashield	80 g/m2 + 60 g/m2	70D 3L Gore-Tex	No	No	No	Around Town	Regular	890 g / 1 lb 15.4 oz	75 cm / 29.5 in	No
Arc'teryx Macai (Men's)	5/-15	Review	Shell	750	69	1,825	Coreloft Compact	60 + 100 g/m²	N40p-X 3L Gore-Tex	Yes, zips	No	No	Ski/Snowboard	Regular	1 kg / 2 lb 4 oz	76 cm / 30 in	No
Arc'teryx Nuclei SV (Men's - Women's)	5/-15	Review	Synthetic	N/A	N/A	N/A	Coreloft Continuous	190 g/m2 + 90 g/m2	Arato 15	No	Yes	Yes	All Round	Regular	600 g / 1 lb 5.2 oz	81 cm / 31.8 in	No
Black Diamond Access Down (Men's - Women's)	7/-14		Down	700	155	3,827	N/A	N/A	30D ripstop nylon	No	Yes	Yes	All Round	Regular	442 g / 15.6 oz	76 cm / 29.75 in	No
Arc'teryx Kappa (Men's)	7/-14	Review	Synthetic	N/A	N/A	N/A	Coreloft Continuous	140 g/m²	N70p Gore Thermium	No	Yes	No	All Round	Regular	755 g / 1 lb 10.6 oz	80 cm / 31.5 in	Yes
Patagonia Jackson Glacier Parka (Men's - Women's)	7/-14		Parka	700	218	5,383	N/A	N/A	50D Polyester	No	No	No	Around Town	Regular	1.142 kg / 2 lb 8.3 oz	?	No
Arc'teryx Prema Down Coat (Women's)	7/-14		Parka	750	92	2,434	N/A	N/A	Nylon	No	Yes	No	Around Town	Regular	794 g / 1 lb 12 oz	117 cm / 46.1 in	Yes
Arc'teryx Radsten Insulated (Men's)	7/-14		Parka	N/A	N/A	N/A	Coreloft Compact	120 g/m²	NP100d Gore-Tex 2L	No	No	No	Around Town	Regular	715 g / 1 lb 9.2 oz	73 cm / 28.75 in	Yes
Rab Microlight Alpine (Men's - Women's)	7/-14		Down	700	153	3,778	N/A	N/A	30D Pertex Quantum	No	No	Yes	All Round	Regular	466 g / 1 lb 0.5 oz	72 cm / 28.5 in	No
Feathered Friends Eos	8/-13		Down	900	105	3,333	N/A	N/A	Pertex Quantum	No	No	Yes	All Round	Regular	306 g / 10.8 oz	?	No
Patagonia Macro Puff (Men's - Women's)	8/-13	Review	Synthetic	N/A	N/A	N/A	PlumaFill	135 + 90 g	10D Recycled nylon ripstop	No	No	No	All Round	Regular	435 g / 15.3 oz	79 cm / 31 in	Yes
Arc'teryx Macai Lightweight (aka LT) (Men's)	8/-13		Shell	750	49	1,296	Coreloft Compact	60 g/m²	N40p-X 3L Gore-Tex	Yes, zips	No	No	Ski/Snowboard	Regular	855 g / 1 lb 14.2 oz	74 cm / 29.1 in	No
Patagonia Tres 3-in-1 (Men's - Women's)	8/-13	Review	Parka	700	118	2,914	N/A	N/A	5.5 oz polyester	No	No	No	Around Town	Regular	1.307 kg / 2 lb 14.1 oz	85 cm / 33.5 in	No
Arc'teryx Seyla (Women's)	8/-13		Parka	750	92	2,434	N/A	N/A	Arato 10	No	Yes	No	Around Town	Regular	507 g / 1 lb. 1.9 oz.	87 cm / 34.4 in	Yes
Arc'teryx Koda (Men's)	8/-13		Parka	N/A	N/A	N/A	Coreloft	80 + 140 g/m²	N80p-X Gore-Tex	No	No	No	Around Town	Regular	720 g / 1 lb 9.4 oz	75 cm / 29.5 in	Yes
Patagonia DAS (Men's - Women's)	10/-12	Review	Synthetic	N/A	N/A	N/A	PrimaLoft Gold Insulation Eco	133 + 40 g	Pertex Quantum Pro	No	Yes	Yes	All Round	Regular	555 g / 1 lb 3.6 oz	84 cm / 33 in	No
Patagonia Vosque 3-in-1 (Women's)	10/-12	Review	Parka	N/A	N/A	N/A	ThermoLite	100 g	65% nylon, 35% polyester	No	No	No	Around Town	Regular	1.360 kg / 3 lb	90 cm / 35.5 in	No
Arc'teryx Thorium (Men's - Women's)	12/-11	Review	Down	750	140	3,704	Coreloft	80 + 140 g/m²	Arato 30	No	Yes	Yes	All Round	Regular	517 g / 1 lb 2.2 oz	71.5 cm / 28.1 in	No
Patagonia City Storm Down (Men's - Women's)	12/-11		Parka	700	191	4,716	N/A	N/A	4.2 oz polyester	No	No	Yes	All Round	Regular	468 g / 16.5 oz	91 cm / 36 in	Yes
Patagonia Jackson Glacier (Men's - Women's)	12/-11	Review	Down	700	141	3,482	N/A	N/A	3.6 oz 50D polyester	No	Yes	No	Around Town	Regular	880 g / 1 lb 15 oz	79 cm / 31 in	No
Arc'teryx Thorium AR 2020 (Men's - Women's)	14/-10	Review	Down	750	130	3,439	Coreloft	80 + 140 g/m²	Arato 30	No	No	Yes	All Round	Regular	490 g / 1 lb 1.3 oz	72 cm / 28.3 in	Yes
Patagonia Fitz Roy (Men's - Women's)	14/-10		Down	800	128	3,612	N/A	N/A	20D Nylon	No	No	Yes	All Round	Regular	632 g / 1lb 6.3 oz	74 cm / 29 in	No
Arc'teryx Sensa (Women's)	14/-10		Parka	N/A	N/A	N/A	Coreloft Compact	120 g/m²	NP100d Gore-Tex 2L	No	Yes	No	Around Town	Relaxed	785 g / 1 lb 11.7 oz	86 cm / 34 in	Yes
Arc'teryx Ralle (Men's)	14/-10		Parka	N/A	N/A	N/A	Coreloft	120 g/m²	N80p-X 2L Gore-Tex	No	Yes	No	Around Town	Regular	735 g / 1 lb 9.9 oz	83 cm / 32.5 in	No
Patagonia Hi-Loft (Men's - Women's)	14/-10	Review	Down	600	177	3,746	N/A	N/A	1.4 oz 30D polyester	No	No	Yes	All Round	Regular	540 g / 1 lb 3 oz	76 cm / 30 in	Yes
Arc'teryx Coelle (Women's)	14/-10		Parka	N/A	N/A	N/A	Coreloft	80 + 140 g/m²	40D 2L Gore-Tex	No	Yes	No	Around Town	Regular	?	95 cm / 37.4 in	No
REI Magma 850 Hoodie 2.0 (Men's - Women's)	14/-10		Down	850	120	3,598	N/A	N/A	Pertex mini ripstop nylon	No	No	Yes	All Round	Regular	340 g / 13.75 oz	74 cm / 29.25 in	No
Arc'teryx Beta Insulated Coat (Women's)	16/-9	Review	Parka	N/A	N/A	N/A	Coreloft	80 g/m² + 120 g/m²	2L 40D Gore-Tex	No	Yes	No	Around Town	Regular	600 g / 1 lb 5.2 oz	86 cm / 34 in	No
Arc'teryx Atom Heavyweight (aka AR) (Men's - Women's)	18/-8	Review	Synthetic	N/A	N/A	N/A	Coreloft Continuous	120 g/m2 + 80 g/m2 + 60 g/m2	30D Tyono	Yes, mesh	No	No	All Round	Regular	475 g / 1 lb	74 cm / 29.1 in	No
Patagonia Downdrift (Men's - Women's)	18/-8		Down	600	279	5,905	N/A	N/A	4.2 oz polyester	No	No	No	Around Town	Regular	1.014 kg / 2 lb 3.8 oz	?	No
Arc'teryx Magnus (Men's)	19/-7		Parka	N/A	N/A	N/A	Coreloft	80 g	N60p Gore-Tex 2L	No	No	No	Around Town	Regular	690 g / 1 lb 8.3 oz	83 cm / 32.5 in	Yes
Rab Infinity Microlight (Men's - Women's)	19/-7		Down	700	146	3,605	N/A	N/A	13D Gore-Tex Infinium	No	No	Yes	All Round	Regular	452 g / 15.9 oz	74 cm / 29.1 in	No
Arc'teryx Proton Heavyweight (Men's - Women's)	21/-6	Review	Synthetic	N/A	N/A	N/A	Coreloft	100 g/m2 + 60 g/m2	Fortius Air 50	No	No	No	All Round	Regular	540 g / 1 lb 3 oz	77 cm / 30.5 in	No
Arc'teryx Agrium (Men's - Women's)	21/-6		Down	850	117	3,508	N/A	N/A	Arato	No	No	Yes	All Round	Regular	365 g / 12.9 oz	75 cm / 29.5 in	Yes
Arc'teryx Beta Insulated (Men's - Women's)	21/-6	Review	Parka	N/A	N/A	N/A	Coreloft Continuous	80 g/m²	2L 40D Gore-Tex	Yes, zips	Yes	No	All Round	Regular	680 g / 1 lb 8 oz	78.5 cm / 31 in	No
Arc'teryx Patera (Women's)	21/-6	Review	Parka	750	67	1,773	Coreloft	60 + 80 g/m²	2L Gore-Tex	No	Yes	No	Around Town	Trim	867 g / 1 lb 14.6 oz	99 cm / 39 in	No
Patagonia Topley (Men's)	23/-5		Down	700	172	4,247	N/A	N/A	6 oz polyester	No	Yes	No	All Round	Regular	1.133 kg / 2 lb 8 oz	77 cm / 30.5 in	No
Arc'teryx Alpha IS (Men's)	23/-5		Synthetic	N/A	N/A	N/A	Coreloft Continuous	65 g/m²	N40p-X 2L Gore-Tex	No	Yes	Yes	Climbing	Regular	610 g / 1 lb 5.5 oz	78 cm / 30.75 in	Yes
Patagonia Down Sweater (Men's - Women's)	23/-5	Review	Down	800	150	4,233	N/A	N/A	1.4 oz 20x30D polyester	No	No	Yes	All Round	Regular	428 g / 15.1 oz	67 cm / 26.25 in	No
Arc'teryx Epsilon (Men's)	26/-3		Synthetic	N/A	N/A	N/A	Coreloft Compact	80 g/m²	Fortius 1.0	No	No	No	Around Town	Regular	644 g / 1 lb 6.7 oz	?	No
Patagonia Silent Down (Men's - Women's)	26/-3	Review	Down	700	109	2,691	N/A	N/A	2.2 oz polyester	No	No	No	Around Town	Regular	585 g / 1 lb 4.7 oz	74 cm / 29 in	No
Arc'teryx Therme Insulated (Men's)	26/-3	Review	Synthetic	N/A	N/A	N/A	Coreloft Compact	40 g/m²	2L Gore-Tex	No	No	No	Around Town	Regular	960 g / 2 lb 1.9 oz	73 cm / 28.75 in	Yes
Arc'teryx Cerium (aka LT) (Men's - Women's)	26/-3	Review	Down	850	113	3,388	Coreloft	80 + 100 g/m²	Arato 15	No	No	Yes	All Round	Trim	335 g / 11.8 oz	72 cm / 28.3 in	No
Mountain Hardwear GW/2 (Men's - Women's)	28/-2		Down	800	85	2,399	N/A	N/A	10D Ripstop Nylon	No	No	Yes	All Round	Trim	250 g / 8.8 oz	70 cm / 27.5 in	No
Arc'teryx Cerium LT 2020 (Men's - Women's)	28/-2	Review	Down	850	102	3,058	Coreloft	80 + 100 g/m²	Arato 10	No	No	Yes	All Round	Trim	305 g / 10.8 oz	72 cm / 28.3 in	Yes
Arc'teryx Nuclei (aka FL) (Men's - Women's)	32/0	Review	Synthetic	N/A	N/A	N/A	Coreloft Continuous	65 g/m²	Arato 10r	No	No	Yes	All Round	Regular	325 g / 11.5 oz	75 cm / 29.5 in	No
Patagonia DAS Light (Men's - Women's)	34/1	Review	Synthetic	N/A	N/A	N/A	PlumaFill	65 g	10D Pertex Quantum Pro	No	Yes	Yes	All Round	Regular	320 g / 11.3 oz	77 cm / 30.5 in	No
Patagonia Isthmus (Men's)	36/2		Parka	N/A	N/A	N/A	ThermoGreen	60 g	4.2 oz polyester	No	No	No	Around Town	Regular	895 g / 1 lb 15.6 oz	70 cm / 27.5 in	No
Patagonia AlpLight (Men's - Women's)	36/2		Down	800	100	2,822	N/A	N/A	0.8 oz 10D polyester	No	No	Yes	All Round	Slim	270 g / 9.5 oz	74 cm / 29 in	No
Arc'teryx Proton (aka LT) (Men's - Women's)	37/3	Review	Synthetic	N/A	N/A	N/A	Coreloft Compact	80 g/m2 + 60 g/m2	Fortius Air 20	No	No	No	Climbing	Trim	375 g / 13.2 oz	75 cm / 29.4 in	No
Patagonia Nano Puff (Men's - Women's)	37/3	Review	Synthetic	N/A	N/A	N/A	PrimaLoft Gold Insulation Eco	60 g	22D Polyester	No	No	Yes	All Round	Regular	363 g / 12.8 oz	71.5 cm / 28 in	No
Arc'teryx Norvan SL Ins. (Men's - Women's)	39/4		Shell	N/A	N/A	N/A	Coreloft Compact	40 g/m²	Gore-Tex ShakeDry	No	No	Yes	Running	Trim	270 g / 9.5 oz	71.5 cm / 28.1 in	Yes
Patagonia Micro Puff (Men's - Women's)	41/5	Review	Synthetic	N/A	N/A	N/A	PlumaFill	65 g	Pertex Quantum	No	No	Yes	All Round	Regular	298 g / 10.5 oz	75 cm / 29.5 in	No
Patagonia Nano Air (Men's - Women's)	41/5	Review	Synthetic	N/A	N/A	N/A	FullRange	60 g	33D nylon ripstop	No	No	Yes	All Round	Trim	318 g / 11.2 oz	?	No
Arc'teryx Atom (aka LT) (Men's - Women's)	43/6	Review	Synthetic	N/A	N/A	N/A	Coreloft Continuous	60 g/m²	20D Tyono	Yes, mesh	No	No	All Round	Trim	375 g / 13.2 oz	74 cm / 29.1 in	No
Arc'teryx Cerium Lightweight (aka SL) (Women's)	43/6	Review	Down	850	58	1,739	Coreloft	40 + 100 g/m²	Arato 7	No	No	Yes	All Round	Trim	215 g / 7.6 oz	69 cm / 27.2 in	No
Arc'teryx Cerium Hybrid (Men's)	44/7		Down	850	44	1,319	Coreloft	40 + 100 g/m²	Arato 15 + Fortius Air 50	No	No	Yes	All Round	Trim	260 g / 9.2 oz	70 cm / 27.5 in	No
Arc'teryx Proton Hybrid (Men's - Women's)	46/8	Review	Synthetic	N/A	N/A	N/A	Coreloft Compact	40 g/m²	Fortius Air 50	No	No	No	All Round	Trim	365 g / 12.9 oz	76 cm / 30 in	No
Arc'teryx Proton Lightweight (aka FL) (Men's - Women's)	48/9	Review	Synthetic	N/A	N/A	N/A	Octa Loft	94 g/m²	Fortius Air 20	No	No	No	Climbing	Trim	343 g / 12.1 oz	75 cm / 29.5 in	No
Patagonia Nano Air Light Hybrid (Men's - Women's)	50/10		Synthetic	N/A	N/A	N/A	FullRange	40 g	20D nylon ripstop	No	No	No	All Round	Trim	335 g / 11.8 oz	?	No
Arc'teryx Atom Lightweight (aka SL) (Men's - Women's)	52/11	Review	Synthetic	N/A	N/A	N/A	Coreloft Compact	40 g/m²	20D Tyono	Yes, mesh	No	No	All Round	Trim	270 g / 9.5 oz	72 cm / 28.3 in	No

Assumptions: Worn over a thin shirt, no output, no precipitation, light to no wind. Values are always for size M and for men's, except for women's-only items.

Primary use of this spectrum is for comparison, rather than figuring out absolute temp ratings.

Working principles of insulated jackets: https://outdoorcrunch.com/jackets/
CLO Values: https://outdoorcrunch.com/clo-values/
Best Arc'teryx jackets: https://outdoorcrunch.com/best-arcteryx-jacket/
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Performance ratings of Arc'teryx synthetics

Name	Est. Temp (F/C)	Breathability	Wind Res.	Abrasion res.	Review	Type	Synthetic Fill	Synth. Fill Weight	Face Fabric	Pit venting?	Two way zipper?	Stuffs into itself?	Activity	Fit	Weight	Length (CB)	Discontinued?	Internal pockets	External pockets
Arc'teryx Alpha (Men's - Women's)	-18/-28	No data	No data	No data	Review	Down	Coreloft	90 g/m²	N30r 2L GoreTex Infinium	No	Yes	Yes	Climbing	Regular	805 g / 1 lb 12.4 oz	86 cm / 34 in	No
Feathered Friends Khumbu	-17/-27	No data	No data	No data		Down	Primaloft Gold	200 g	Pretex Shield XT	No	No	Yes	All Round	Regular	960 g / 2 lb 2 oz	?	No
Arc'teryx Ceres SV (Men's - Women's)	-15/-26	No data	No data	No data	Review	Down	Coreloft	?	Arato 30	No	Yes	Yes	All Round	Regular	880 g / 1 lb 15 oz	86 cm / 34 in	Yes
Mountain Equipment K7 (Men's)	-13/-25	No data	No data	No data		Down	N/A	N/A	30D Drilite	No	Yes	Yes	All Round	Regular	820 g / 1 lb 13 oz	76 cm / 30 in	No
Rab Positron Pro (Men's)	-13/-25	No data	No data	No data		Down	N/A	N/A	40D Pertex Quantum Pro	No	Yes	Yes	All Round	Regular	740 g / 1 lb 10 oz	85 cm / 33.5 in	No
Arc'teryx Therme SV (Men's)	-11/-24	No data	No data	No data	Review	Parka	Coreloft	60 g/m²	2L Gore-Tex	No	Yes	No	Around Town	Regular	1.072 kg / 2 lb 5.8 oz	96 cm / 37.75 in	No
Patagonia Grade VII	-11/-24	No data	No data	No data		Down	N/A	N/A	1.2 oz 15 & 20D Pertex Quantum	No	Yes	No	Around Town	Regular	743 g / 1 lb 10.1 oz	83 cm / 32.5 in	Yes
Patagonia AlpLoft (Men's - Women's)	-10/-23	No data	No data	No data		Down	N/A	N/A	Pertex Quantom	No	Yes	Yes	All Round	Regular	680 g / 1 lb 8 oz	81 cm / 31.8 in	No
Arc'teryx Firebee AR (Men's - Women's)	-10/-23	8/10	10/10	No data	Review	Down	N/A	N/A	Arato 7 & 10	No	Yes	Yes	All Round	Regular	680 g / 1 lb 8 oz	79 cm / 31 in	Yes
Mountain Equipment Exo (Men's)	-10/-23	No data	No data	No data		Down	N/A	N/A	Nylon	No	Yes	Yes	All Round	Regular	770 g / 1 lb 11.2 oz	79 cm / 31 in	No
Arc'teryx Thorsen (Men's)	-7/-22	No data	No data	No data	Review	Parka	Coreloft	60 g/m²	90D 2L Gore-Tex	No	Yes	No	Around Town	Regular	1.1 kg / 2 lb 5.4 oz	91 cm / 36 in	Yes
Patagonia Frozen Range (Men's - Women's)	-6/-21	No data	No data	No data	Review	Parka	N/A	N/A	4 oz 75-denier polyester	No	No	No	Around Town	Regular	1.253 kg / 2 lb 12.2 oz	84 cm / 33 in	Yes
Mountain Equipment Li. Ec. (Men's - Women's)	-5/-20	No data	No data	No data		Down	N/A	N/A	50D Drilite	No	Yes	No	All Round	Regular	822 g / 1 lb 13 oz	72 cm / 28 in	Yes
Arc'teryx Thorium Parka (Women's)	-2/-19	No data	No data	No data	Review	Down	Coreloft	80 + 140 g/m²	Arato 20	No	Yes	No	Around Town	Regular	610 g / 1 lb 5.5 oz	115.8 cm / 45.6 in	No
Rab Neutrino Pro (Men's - Women's)	-2/-19	No data	No data	No data		Down	N/A	N/A	20D Pertex Quantum Pro	No	Yes	Yes	All Round	Regular	585 g / 1 lb 8.6 oz	77 cm / 30.3 in	No
Arc'teryx Patera Long (Women's)	0/-18	No data	No data	No data		Parka	Coreloft	60 + 80 g/m²	2L Gore-Tex	No	Yes	No	Around Town	Regular	1.1 kg / 2 lb 6.8 oz	117.5 cm / 46.25 in	No
Patagonia Stormshadow (Men's)	0/-18	No data	No data	No data		Parka	N/A	N/A	75D Polyester	No	No	No	Around Town	Regular	1.182 kg / 2 lb 9.7 oz	?	No
Arc'teryx Beta Down Insulated (Men's)	0/-18	No data	No data	No data		Parka	Coreloft	80 g/m²	2L 40D Gore-Tex	Yes	Yes	No	All Round	Regular	760 g / 1 lb 10.8 oz	79 cm / 31 in	No
Arc'teryx Dually Belay (Men's)	0/-18	No data	No data	No data	Review	Synthetic	ThermaTek	92 g/m²	30D Nylon	No	Yes	Yes	Around Town	Regular	705 g / 1 lb 9 oz	84 cm / 33 in	Yes
Arc'teryx Centrale (Women's)	0/-18	No data	No data	No data	Review	Parka	Coreloft	60 g/m²	N90p Nylon	No	Yes	No	Around Town	Regular	885 g / 1 lb 15.2 oz	95 cm / 37.5 in	Yes
Arc'teryx Thorium SV Parka (Men's)	0/-18	No data	No data	No data		Down	Coreloft	80 + 140 g/m²	Arato 30 & 2L Gore-Tex Infinium	No	Yes	No	Around Town	Regular	685 g / 1 lb 8.2 oz	85 cm / 33.5 in	No
Arc'teryx Camosun (Men's)	0/-18	No data	No data	No data	Review	Parka	Coreloft	140 g/m²	N150p-X Gore-Tex	No	No	No	Around Town	Trim	960 g / 2 lb 1.9 oz	80 cm / 31.5 in	Yes
Arc'teryx Cerium SV (Men's - Women's)	0/-18	No data	No data	No data	Review	Down	Coreloft	80 + 140 g/m²	Arato 7 & 10	No	No	Yes	All Round	Regular	415 g / 14.6 oz	69.5 cm / 27.4 in	Yes
Arc'teryx Liatris Parka (Women's)	2/-17	No data	No data	No data		Parka	Climashield	80 g/m2 + 60 g/m2	70D 3L Gore-Tex	No	No	No	Around Town	Regular	1.093 kg / 2 lb 6.6 oz	109 cm / 43 in	No
Arc'teryx Revet (Men's)	2/-17	No data	No data	No data		Parka	N/A	N/A	20d nylon/spandex double weave	No	Yes	No	Around Town	Regular	755 g / 1 lb 10.6 oz	91 cm / 36 in	Yes
Arc'teryx Thorium SV (Men's)	3/-16	No data	No data	No data		Down	Coreloft	80 + 140 g/m²	Arato 30 & 2L Gore-Tex Infinium	No	Yes	Yes	Around Town	Regular	645 g / 1 lb 6.8 oz	73 cm / 28.75 in	No
Arc'teryx Piedmont (Men's)	3/-16	No data	No data	No data		Parka	N/A	N/A	Arato 10	No	Yes	Yes	Around Town	Regular	515 g / 1 lb 2.2 oz	82 cm / 32.25 in	Yes
Outdoor Research Sup. Alp. (Men's - Women's)	3/-16	No data	No data	No data		Down	N/A	N/A	30D Pertex Quantum Pro	No	Yes	No	All Round	Regular	825 g / 1 lb 13.1 oz	85 cm / 33.5 in	No
Arc'teryx Fission SV (Men's - Women's)	3/-16	3/10	No data	No data	Review	Synthetic	Coreloft Continuous	90 + 65 g/m²	N80p-X Gore-Tex 2L	No	Yes	No	All Round	Regular	890 g / 1 lb 15.4 oz	81 cm / 31.8 in	Yes
Arc'teryx Alessa Long	3/-16	No data	No data	No data		Parka	Coreloft	80 + 120 g/m²	N90p 2L Gore-Tex	No	No	No	Around Town	Regular	1.015 kg / 2 lb 3.8 oz	123 cm / 48.5 in	Yes
Arc'teryx Radsten Parka (Men's)	3/-16	No data	No data	No data		Parka	Coreloft Compact	120 g/m²	NP100d Gore-Tex 2L	No	No	No	Around Town	Regular	745 g / 1 lb 10.3 oz	82 cm / 32.25 in	Yes
Rab Electron Pro (Men's - Women's)	5/-15	No data	No data	No data		Down	N/A	N/A	20D Pertex Quantum Pro	No	Yes	Yes	All Round	Regular	525 g / 1 lb 2.5 oz	74 cm / 29 in	No
Rab Infinity Alpine (Men's)	5/-15	No data	No data	No data		Down	N/A	N/A	30D & 13D Gore-Tex Infinium	No	Yes	Yes	All Round	Regular	551 g / 1 lb 3.4 oz	76.5 cm / 30.1 in	No
Arc'teryx Alpha Lightweight (Men's - Women's)	5/-15	No data	No data	No data		Down	Coreloft Compact	40 g/m²	Hadron 2L Gore-Tex Infinium	No	Yes	Yes	Climbing	Regular	540 g / 1 lb 3 oz	79.5 cm / 31.25 in	No
Arc'teryx Therme Parka (Men's)	5/-15	No data	No data	No data	Review	Parka	Coreloft	60 + 80 g/m²	P75d Polyester	No	Yes	No	Around Town	Regular	991 g / 2 lb 3 oz	85 cm / 33.5 in	No
Arc'teryx Liatris (Women's)	5/-15	No data	No data	No data		Parka	Climashield	80 g/m2 + 60 g/m2	70D 3L Gore-Tex	No	No	No	Around Town	Regular	890 g / 1 lb 15.4 oz	75 cm / 29.5 in	No
Arc'teryx Macai (Men's)	5/-15	No data	No data	No data	Review	Shell	Coreloft Compact	60 + 100 g/m²	N40p-X 3L Gore-Tex	Yes, zips	No	No	Ski/Snowboard	Regular	1 kg / 2 lb 4 oz	76 cm / 30 in	No
Arc'teryx Nuclei SV (Men's - Women's)	5/-15	1/10	10/10	2/10	Review	Synthetic	Coreloft Continuous	190 g/m2 + 90 g/m2	Arato 15	No	Yes	Yes	All Round	Regular	600 g / 1 lb 5.2 oz	81 cm / 31.8 in	No	2x dump	1x chest
Black Diamond Access Down (Men's - Women's)	7/-14	No data	No data	No data		Down	N/A	N/A	30D ripstop nylon	No	Yes	Yes	All Round	Regular	442 g / 15.6 oz	76 cm / 29.75 in	No
Arc'teryx Kappa (Men's)	7/-14	No data	9/10	9/10	Review	Synthetic	Coreloft Continuous	140 g/m²	N70p Gore Thermium	No	Yes	No	All Round	Regular	755 g / 1 lb 10.6 oz	80 cm / 31.5 in	Yes
Patagonia Jackson Glacier Parka (Men's - Women's)	7/-14	No data	No data	No data		Parka	N/A	N/A	50D Polyester	No	No	No	Around Town	Regular	1.142 kg / 2 lb 8.3 oz	?	No
Arc'teryx Prema Down Coat (Women's)	7/-14	No data	No data	No data		Parka	N/A	N/A	Nylon	No	Yes	No	Around Town	Regular	794 g / 1 lb 12 oz	117 cm / 46.1 in	Yes
Arc'teryx Radsten Insulated (Men's)	7/-14	No data	No data	No data		Parka	Coreloft Compact	120 g/m²	NP100d Gore-Tex 2L	No	No	No	Around Town	Regular	715 g / 1 lb 9.2 oz	73 cm / 28.75 in	Yes
Rab Microlight Alpine (Men's - Women's)	7/-14	No data	No data	No data		Down	N/A	N/A	30D Pertex Quantum	No	No	Yes	All Round	Regular	466 g / 1 lb 0.5 oz	72 cm / 28.5 in	No
Feathered Friends Eos	8/-13	No data	No data	No data		Down	N/A	N/A	Pertex Quantum	No	No	Yes	All Round	Regular	306 g / 10.8 oz	?	No
Patagonia Macro Puff (Men's - Women's)	8/-13	No data	No data	No data	Review	Synthetic	PlumaFill	135 + 90 g	10D Recycled nylon ripstop	No	No	No	All Round	Regular	435 g / 15.3 oz	79 cm / 31 in	Yes
Arc'teryx Macai Lightweight (aka LT) (Men's)	8/-13	No data	No data	No data		Shell	Coreloft Compact	60 g/m²	N40p-X 3L Gore-Tex	Yes, zips	No	No	Ski/Snowboard	Regular	855 g / 1 lb 14.2 oz	74 cm / 29.1 in	No
Patagonia Tres 3-in-1 (Men's - Women's)	8/-13	No data	No data	No data	Review	Parka	N/A	N/A	5.5 oz polyester	No	No	No	Around Town	Regular	1.307 kg / 2 lb 14.1 oz	85 cm / 33.5 in	No
Arc'teryx Seyla (Women's)	8/-13	No data	No data	No data		Parka	N/A	N/A	Arato 10	No	Yes	No	Around Town	Regular	507 g / 1 lb. 1.9 oz.	87 cm / 34.4 in	Yes
Arc'teryx Koda (Men's)	8/-13	No data	No data	No data		Parka	Coreloft	80 + 140 g/m²	N80p-X Gore-Tex	No	No	No	Around Town	Regular	720 g / 1 lb 9.4 oz	75 cm / 29.5 in	Yes
Patagonia DAS (Men's - Women's)	10/-12	1/10	9/10	3/10	Review	Synthetic	PrimaLoft Gold Insulation Eco	133 + 40 g	Pertex Quantum Pro	No	Yes	Yes	All Round	Regular	555 g / 1 lb 3.6 oz	84 cm / 33 in	No	2x dump	1x chest
Patagonia Vosque 3-in-1 (Women's)	10/-12	No data	No data	No data	Review	Parka	ThermoLite	100 g	65% nylon, 35% polyester	No	No	No	Around Town	Regular	1.360 kg / 3 lb	90 cm / 35.5 in	No
Arc'teryx Thorium (Men's - Women's)	12/-11	No data	No data	No data	Review	Down	Coreloft	80 + 140 g/m²	Arato 30	No	Yes	Yes	All Round	Regular	517 g / 1 lb 2.2 oz	71.5 cm / 28.1 in	No
Patagonia City Storm Down (Men's - Women's)	12/-11	No data	No data	No data		Parka	N/A	N/A	4.2 oz polyester	No	No	Yes	All Round	Regular	468 g / 16.5 oz	91 cm / 36 in	Yes
Patagonia Jackson Glacier (Men's - Women's)	12/-11	No data	No data	No data	Review	Down	N/A	N/A	3.6 oz 50D polyester	No	Yes	No	Around Town	Regular	880 g / 1 lb 15 oz	79 cm / 31 in	No
Arc'teryx Thorium AR 2020 (Men's - Women's)	14/-10	No data	No data	No data	Review	Down	Coreloft	80 + 140 g/m²	Arato 30	No	No	Yes	All Round	Regular	490 g / 1 lb 1.3 oz	72 cm / 28.3 in	Yes
Patagonia Fitz Roy (Men's - Women's)	14/-10	No data	No data	No data		Down	N/A	N/A	20D Nylon	No	No	Yes	All Round	Regular	632 g / 1lb 6.3 oz	74 cm / 29 in	No
Arc'teryx Sensa (Women's)	14/-10	No data	No data	No data		Parka	Coreloft Compact	120 g/m²	NP100d Gore-Tex 2L	No	Yes	No	Around Town	Relaxed	785 g / 1 lb 11.7 oz	86 cm / 34 in	Yes
Arc'teryx Ralle (Men's)	14/-10	No data	No data	No data		Parka	Coreloft	120 g/m²	N80p-X 2L Gore-Tex	No	Yes	No	Around Town	Regular	735 g / 1 lb 9.9 oz	83 cm / 32.5 in	No
Patagonia Hi-Loft (Men's - Women's)	14/-10	No data	No data	No data	Review	Down	N/A	N/A	1.4 oz 30D polyester	No	No	Yes	All Round	Regular	540 g / 1 lb 3 oz	76 cm / 30 in	Yes
Arc'teryx Coelle (Women's)	14/-10	No data	No data	No data		Parka	Coreloft	80 + 140 g/m²	40D 2L Gore-Tex	No	Yes	No	Around Town	Regular	?	95 cm / 37.4 in	No
REI Magma 850 Hoodie 2.0 (Men's - Women's)	14/-10	No data	No data	No data		Down	N/A	N/A	Pertex mini ripstop nylon	No	No	Yes	All Round	Regular	340 g / 13.75 oz	74 cm / 29.25 in	No
Arc'teryx Beta Insulated Coat (Women's)	16/-9	No data	No data	No data	Review	Parka	Coreloft	80 g/m² + 120 g/m²	2L 40D Gore-Tex	No	Yes	No	Around Town	Regular	600 g / 1 lb 5.2 oz	86 cm / 34 in	No
Arc'teryx Atom Heavyweight (aka AR) (Men's - Women's)	18/-8	4/10	8/10	8/10	Review	Synthetic	Coreloft Continuous	120 g/m2 + 80 g/m2 + 60 g/m2	30D Tyono	Yes, mesh	No	No	All Round	Regular	475 g / 1 lb	74 cm / 29.1 in	No	1x chest	-
Patagonia Downdrift (Men's - Women's)	18/-8	No data	No data	No data		Down	N/A	N/A	4.2 oz polyester	No	No	No	Around Town	Regular	1.014 kg / 2 lb 3.8 oz	?	No
Arc'teryx Magnus (Men's)	19/-7	No data	No data	No data		Parka	Coreloft	80 g	N60p Gore-Tex 2L	No	No	No	Around Town	Regular	690 g / 1 lb 8.3 oz	83 cm / 32.5 in	Yes
Rab Infinity Microlight (Men's - Women's)	19/-7	No data	No data	No data		Down	N/A	N/A	13D Gore-Tex Infinium	No	No	Yes	All Round	Regular	452 g / 15.9 oz	74 cm / 29.1 in	No
Arc'teryx Proton Heavyweight (Men's - Women's)	21/-6	6/10	7/10	10/10	Review	Synthetic	Coreloft	100 g/m2 + 60 g/m2	Fortius Air 50	No	No	No	All Round	Regular	540 g / 1 lb 3 oz	77 cm / 30.5 in	No	2x dump	2x chest
Arc'teryx Agrium (Men's - Women's)	21/-6	No data	No data	No data		Down	N/A	N/A	Arato	No	No	Yes	All Round	Regular	365 g / 12.9 oz	75 cm / 29.5 in	Yes
Arc'teryx Beta Insulated (Men's - Women's)	21/-6	No data	No data	No data	Review	Parka	Coreloft Continuous	80 g/m²	2L 40D Gore-Tex	Yes, zips	Yes	No	All Round	Regular	680 g / 1 lb 8 oz	78.5 cm / 31 in	No
Arc'teryx Patera (Women's)	21/-6	No data	No data	No data	Review	Parka	Coreloft	60 + 80 g/m²	2L Gore-Tex	No	Yes	No	Around Town	Trim	867 g / 1 lb 14.6 oz	99 cm / 39 in	No
Patagonia Topley (Men's)	23/-5	No data	No data	No data		Down	N/A	N/A	6 oz polyester	No	Yes	No	All Round	Regular	1.133 kg / 2 lb 8 oz	77 cm / 30.5 in	No
Arc'teryx Alpha IS (Men's)	23/-5	No data	No data	No data		Synthetic	Coreloft Continuous	65 g/m²	N40p-X 2L Gore-Tex	No	Yes	Yes	Climbing	Regular	610 g / 1 lb 5.5 oz	78 cm / 30.75 in	Yes
Patagonia Down Sweater (Men's - Women's)	23/-5	No data	No data	No data	Review	Down	N/A	N/A	1.4 oz 20x30D polyester	No	No	Yes	All Round	Regular	428 g / 15.1 oz	67 cm / 26.25 in	No
Arc'teryx Epsilon (Men's)	26/-3	No data	No data	No data		Synthetic	Coreloft Compact	80 g/m²	Fortius 1.0	No	No	No	Around Town	Regular	644 g / 1 lb 6.7 oz	?	No	1x chest	-
Patagonia Silent Down (Men's - Women's)	26/-3	No data	No data	No data	Review	Down	N/A	N/A	2.2 oz polyester	No	No	No	Around Town	Regular	585 g / 1 lb 4.7 oz	74 cm / 29 in	No
Arc'teryx Therme Insulated (Men's)	26/-3	No data	No data	No data	Review	Synthetic	Coreloft Compact	40 g/m²	2L Gore-Tex	No	No	No	Around Town	Regular	960 g / 2 lb 1.9 oz	73 cm / 28.75 in	Yes
Arc'teryx Cerium (aka LT) (Men's - Women's)	26/-3	No data	No data	No data	Review	Down	Coreloft	80 + 100 g/m²	Arato 15	No	No	Yes	All Round	Trim	335 g / 11.8 oz	72 cm / 28.3 in	No
Mountain Hardwear GW/2 (Men's - Women's)	28/-2	No data	No data	No data		Down	N/A	N/A	10D Ripstop Nylon	No	No	Yes	All Round	Trim	250 g / 8.8 oz	70 cm / 27.5 in	No
Arc'teryx Cerium LT 2020 (Men's - Women's)	28/-2	No data	No data	No data	Review	Down	Coreloft	80 + 100 g/m²	Arato 10	No	No	Yes	All Round	Trim	305 g / 10.8 oz	72 cm / 28.3 in	Yes
Arc'teryx Nuclei (aka FL) (Men's - Women's)	32/0	2/10	9/10	2/10	Review	Synthetic	Coreloft Continuous	65 g/m²	Arato 10r	No	No	Yes	All Round	Regular	325 g / 11.5 oz	75 cm / 29.5 in	No	2x dump	-
Patagonia DAS Light (Men's - Women's)	34/1	2/10	8/10	2/10	Review	Synthetic	PlumaFill	65 g	10D Pertex Quantum Pro	No	Yes	Yes	All Round	Regular	320 g / 11.3 oz	77 cm / 30.5 in	No	-	1x chest
Patagonia Isthmus (Men's)	36/2	No data	No data	No data		Parka	ThermoGreen	60 g	4.2 oz polyester	No	No	No	Around Town	Regular	895 g / 1 lb 15.6 oz	70 cm / 27.5 in	No
Patagonia AlpLight (Men's - Women's)	36/2	No data	No data	No data		Down	N/A	N/A	0.8 oz 10D polyester	No	No	Yes	All Round	Slim	270 g / 9.5 oz	74 cm / 29 in	No
Arc'teryx Proton (aka LT) (Men's - Women's)	37/3	7/10	7/10	8/10	Review	Synthetic	Coreloft Compact	80 g/m2 + 60 g/m2	Fortius Air 20	No	No	No	Climbing	Trim	375 g / 13.2 oz	75 cm / 29.4 in	No	-	1x chest
Patagonia Nano Puff (Men's - Women's)	37/3	4/10	6/10	6/10	Review	Synthetic	PrimaLoft Gold Insulation Eco	60 g	22D Polyester	No	No	Yes	All Round	Regular	363 g / 12.8 oz	71.5 cm / 28 in	No	1x chest	-
Arc'teryx Norvan SL Ins. (Men's - Women's)	39/4	No data	No data	No data		Shell	Coreloft Compact	40 g/m²	Gore-Tex ShakeDry	No	No	Yes	Running	Trim	270 g / 9.5 oz	71.5 cm / 28.1 in	Yes
Patagonia Micro Puff (Men's - Women's)	41/5	5/10	6/10	5/10	Review	Synthetic	PlumaFill	65 g	Pertex Quantum	No	No	Yes	All Round	Regular	298 g / 10.5 oz	75 cm / 29.5 in	No	2x dump	-
Patagonia Nano Air (Men's - Women's)	41/5	7/10	5/10	5/10	Review	Synthetic	FullRange	60 g	33D nylon ripstop	No	No	Yes	All Round	Trim	318 g / 11.2 oz	?	No	-	2x chest
Arc'teryx Atom (aka LT) (Men's - Women's)	43/6	9/10	6/10	7/10	Review	Synthetic	Coreloft Continuous	60 g/m²	20D Tyono	Yes, mesh	No	No	All Round	Trim	375 g / 13.2 oz	74 cm / 29.1 in	No	1x chest	-
Arc'teryx Cerium Lightweight (aka SL) (Women's)	43/6	No data	No data	No data	Review	Down	Coreloft	40 + 100 g/m²	Arato 7	No	No	Yes	All Round	Trim	215 g / 7.6 oz	69 cm / 27.2 in	No
Arc'teryx Cerium Hybrid (Men's)	44/7	No data	No data	No data		Down	Coreloft	40 + 100 g/m²	Arato 15 + Fortius Air 50	No	No	Yes	All Round	Trim	260 g / 9.2 oz	70 cm / 27.5 in	No
Arc'teryx Proton Hybrid (Men's - Women's)	46/8	5/10	8/10	8/10	Review	Synthetic	Coreloft Compact	40 g/m²	Fortius Air 50	No	No	No	All Round	Trim	365 g / 12.9 oz	76 cm / 30 in	No	-	1x chest
Arc'teryx Proton Lightweight (aka FL) (Men's - Women's)	48/9	8/10	4/10	7/10	Review	Synthetic	Octa Loft	94 g/m²	Fortius Air 20	No	No	No	Climbing	Trim	343 g / 12.1 oz	75 cm / 29.5 in	No	-	1x chest
Patagonia Nano Air Light Hybrid (Men's - Women's)	50/10	No data	No data	No data		Synthetic	FullRange	40 g	20D nylon ripstop	No	No	No	All Round	Trim	335 g / 11.8 oz	?	No
Arc'teryx Atom Lightweight (aka SL) (Men's - Women's)	52/11	10/10	2/10	7/10	Review	Synthetic	Coreloft Compact	40 g/m²	20D Tyono	Yes, mesh	No	No	All Round	Trim	270 g / 9.5 oz	72 cm / 28.3 in	No	-	-

Performance data axis of synthetic jackets (this table) and shell jackets (table below) are different. Don't compare them.

Best synthetic insulated jackets: https://outdoorcrunch.com/synthetic-insulated-jackets/

Performance ratings of Arc'teryx shells

Name	Activity	Breathability	Weather Res.	Durability	Packability	Temp (F/C)	Bottom line	Review	Pit zips?	Two way zipper?	Stuffs into itself?	Face Fabric	Fit	Weight	Length	Discontinued?
Alpha FL (Men's - Women's)	Climbing	7/10	No data	No data	10/10	N/A			No	No	Yes	Hadron 3L Gore-Tex	Trim	209 g / 7.4 oz	76.5 cm / 30 in	Yes
Alpha SL (Men's - Women's)	Climbing	5/10	7/10	No data	9/10	N/A			No	No	Yes	N40p 3L Gore-Tex	Trim	326 g / 11.5 oz	77.5 cm / 30.5 in	Yes
Alpha (aka AR) (Men's - Women's)	Climbing	8/10	9/10	8/10	4/10	N/A	Go-to climbing harshell.	Review	Yes	No	No	N40d & N80d Most Rugged 3L Gore-Tex Pro	Regular	430 g / 15.2 oz	79.5 cm / 31.25 in	No
Alpha SV (Men's - Women's)	Climbing	8/10	10/10	10/10	3/10	N/A	Strongest climbing hardshell.	Review	Yes	No	No	N100d Most Rugged 3L Gore-Tex Pro	Regular	510 g / 1 lb 2 oz	78 cm / 30.75 in	No
Alpha IS (Men's)	Climbing	7/10	5/10	No data	8/10	23/-5			No	Yes	Yes	N40p-X 2L Gore-Tex	Regular	610 g / 1 lb 5.5 oz	78 cm / 30.75 in	Yes
Beta (Men's - Women's)	All Round	6/10	7/10	7/10	8/10	N/A	Streamlined all-doer shell.	Review	No	No	No	N30p-X 3L Gore-Tex	Trim	300 g / 10.6 oz	76 cm / 30 in	No
Beta Lightweight (Men's - Women's)	All Round	8/10	7/10	7/10	6/10	N/A		Review	Yes	No	No	N40p 3L Gore-Tex	Fitted	380 g / 13.4 oz	75 cm / 29.5 in	No
Beta LT (Men's - Women's)	All Round	7/10	7/10	8/10	6/10	N/A		Review	Yes	No	No	N40d 3L Gore-Tex	Fitted	395 g / 13.9 oz	76 cm / 30 in	No
Beta AR (Men's - Women's)	All Round	8/10	9/10	9/10	4/10	N/A	Go-to all-round harshell.	Review	Yes	No	No	N40d & N80d Most Rugged 3L Gore-Tex Pro	Regular	460 g / 1 lb	76 cm / 30 in	No
Beta AR StormHood (Men's - Women's)	All Round	8/10	9/10	9/10	4/10	N/A		Review	Yes	No	No	N40d & N80d Most Rugged 3L Gore-Tex Pro	Regular	460 g / 1 lb	76 cm / 30 in	No
Beta Coat (Women's)	All Round	6/10	5/10	No data	5/10	N/A			No	Yes	No	3L Gore-Tex	Regular	320 g / 11.3 oz	88 cm / 34.5 in	No
Beta Insulated (Men's - Women's)	All Round	9/10	7/10	8/10	No data	21/-6	Go-to hybrid jacket.	Review	Yes	Yes	No	N40d 2L Gore-Tex	Regular	680 g / 1 lb 8 oz	78.5 cm / 31 in	No
Beta Insulated Coat (Women's)	All Round	7/10	No data	No data	No data	16/-9			No	Yes	No	N40d 2L Gore-Tex	Regular	600 g / 1 lb 5.2 oz	86 cm / 34 in	No
Beta Down Insulated (Men's)	All Round	9/10	7/10	8/10	No data	0/-18			Yes	Yes	No	2L 40D Gore-Tex	Regular	760 g / 1 lb 10.8 oz	79 cm / 31 in	No
Beta Long	All Round	4/10	9/10	No data	3/10	N/A		Review	No	No	No	N80p 3L Gore-Tex	Regular	441 g / 15.6 oz	85 cm / 33.5 in	Yes
Beta LT Hadron	All Round	7/10	6/10	4/10	5/10	N/A			No	No	No	Hadron 3L Gore-Tex	Fitted	255 g / 9 oz	76 cm / 30 in	Yes
Beta SV (Men's - Women's)	All Round	8/10	10/10	10/10	3/10	N/A	Strongest all-round harshell.	Review	Yes	No	No	N80p-X Most Rugged 3L Gore-Tex Pro	Regular	495 g / 1 lb 1.5 oz	79 cm / 31 in	Yes
Gamma Lw. (aka SL) (Men's - Women's)	All Round	7/10	2/10	6/10	5/10	N/A		Review	No	No	No	Fortius 1.0	Trim	310 g / 10.9 oz	74 cm / 29.1 in	No
Gamma (aka LT) (Men's - Women's)	All Round	7/10	3/10	7/10	3/10	N/A	Go-to softshell.	Review	No	No	No	Wee Burly Double Weave	Regular	545 g / 1 lb 3.2 oz	76 cm / 30 in	No
Gamma MX (Men's - Women's)	All Round	6/10	4/10	8/10	3/10	N/A	Strongest softshell.	Review	No	No	No	Fortius 2.0	Regular	555 g / 1 lb 3.6 oz	74 cm / 29.1 in	No
Sabre SV (Men's)	Skiing	10/10	10/10	10/10	1/10	N/A	Strongest ski jacket.	Review	Yes	Yes	No	N100d Most Rugged 3L Gore-Tex Pro	Regular	595 g / 1 lb 5 oz	85 cm / 33.5 in	No
Sabre (Men's)	Skiing	8/10	8/10	7/10	2/10	N/A		Review	Yes	No	No	N80p-X 3L Gore-Tex	Regular	705 g / 1 lb 8.9 oz	79 cm / 31 in	No
Sabre Insulated (Men's)	Skiing	7/10	No data	6/10	No data	No data		Review	Yes	No	No	N80p 2L Gore-Tex	Regular	815 g / 1 lb 12.7 oz	76 cm / 30 in	No
Rush (Men's)	Skiing	8/10	9/10	9/10	3/10	N/A	Go-to ski jacket.	Review	Yes	No	No	N80p-X & N100p-X 3L Most Rugged Gore-Tex Pro	Regular	590 g / 1 lb 4.8 oz	79.5 cm / 31.25 in	No
Rush Insulated (Men's - Women's)	Skiing	3/10	5/10	5/10	9/10	16/-9		Review	No	No	Yes	Hadron 2L Gore-Tex Infinium	Regular	515 g / 1 lb 2.2 oz	79 cm / 31 in	No
Macai Shell (Men's)	Skiing	No data	No data	No data	No data	N/A		Review	Yes	No	No	N80p-X 3L Gore-Tex	Regular	775 g / 1 lb 11.3 oz	?	No
Macai (Men's)	Skiing	7/10	7/10	6/10	1/10	5/-15		Review	Yes	No	No	N40p-X 3L Gore-Tex	Regular	990 g / 2 lb 2.9 oz	75 cm / 29.5 in	No
Macai Lightweight (aka LT) (Men's)	Skiing	7/10	7/10	6/10	2/10	8/-13		Review	Yes	No	No	N40p-X 3L Gore-Tex	Regular	855 g / 1 lb 14.2 oz	?	No
Theriss Down (Women's)	Skiing	7/10	6/10	7/10	2/10	No data		Review	Yes	No	No	N80p 2L Gore-Tex	Regular	709 g / 1 lb 9 oz	63 cm / 24.8 in	No
Sentinel (Women's)	Skiing	8/10	7/10	7/10	2/10	N/A	Go-to ski jacket.	Review	Yes	No	No	N70p 3L Gore-Tex	Regular	640 g / 1 lb 6.6 oz	73.7 cm / 29 in	No
Sentinel Insulated (Women's)	Skiing	8/10	No data	No data	No data	21/-6		Review	Yes	No	No	N80p 2L Gore-Tex	Regular	600 g / 1 lb 5.2 oz	79.8 cm / 31.5 in	No
Sentinel Relaxed (Women's)	Skiing	No data	No data	No data	No data	N/A			Yes	No	No	N80p 3L Gore-Tex	Regular	655 g / 1 lb 7.1 oz	?	No
Sidewinder (Women's)	Skiing	8/10	8/10	7/10	2/10	N/A			Yes	No	No	N80p 3L Gore-Tex	Regular	570 g / 1 lb 4.1 oz	?	No
Andessa (Women's)	Skiing	10/10	No data	No data	1/10	8/-13			Yes	No	No	N40d 3L Gore-Tex	Trim	869 g / 1 lb 14.7 oz	67 cm / 26.4 in	Yes
Andessa Shell (Women's)	Skiing	5/10	No data	No data	3/10	N/A			No	No	No	N70p 3L Gore-Tex	Trim	560 g / 1 lb 3.8 oz	?	Yes
Micon Heather	Skiing	No data	No data	No data	No data	N/A			Yes	No	No	NP100-d 3L Gore-Tex	Regular	685 g / 1 lb 8.2 oz	83 cm / 32.5 in	Yes
Micon (Men's)	Skiing	No data	No data	No data	No data	N/A			Yes	No	No	N80p 3L Gore-Tex	Regular	685 g / 1 lb 8.2 oz	83 cm / 32.5 in	Yes
Cassiar (Men's)	Skiing	8/10	7/10	8/10	3/10	N/A		Review	Yes	No	No	N70p 3L Gore-Tex	Trim	820 g / 1 lb 12.9 oz	74.5 cm / 29.3 in	Yes
Cassiar LT (Men's)	Skiing	6/10	6/10	6/10	5/10	N/A		Review	Yes	No	No	N70p 3L Gore-Tex	Trim	605 g / 1 lb 5.3 oz	75 cm / 29.5 in	Yes
Ravenna (Women's)	Skiing	8/10	7/10	8/10	3/10	N/A		Review	Yes	No	No	N70s-4 3L Gore-Tex	Trim	725 g / 1 lb 9.6 oz	69.5 cm / 27.4 in	Yes
Ravenna LT (Women's)	Skiing	6/10	6/10	6/10	5/10	N/A		Review	Yes	No	No	N70p 3L Gore-Tex	Trim	540 g / 1 lb 3 oz	69 cm / 27.2 in	Yes
Procline (Men's)	Skiing	No data	No data	No data	No data	N/A			Yes	No	No	N70p Gore-Tex Infinium	Trim	720 g / 1 lb 9.4 oz	76 cm / 30 in	Yes
Shashka Stretch (Women's)	Skiing	No data	No data	No data	No data	N/A			Yes	No	No	N70p Gore-Tex Infinium	Trim	670 g / 1 lb 7.6 oz	71 cm / 28 in	Yes
Sabre AR (Men's)	Skiing	7/10	8/10	7/10	7/10	N/A		Review	Yes	No	No	N70p 3L Gore-Tex	Regular	700 g / 1 lb 8.7 oz	79 cm / 31 in	Yes
Sentinel AR (Women's)	Skiing	7/10	8/10	7/10	7/10	N/A		Review	Yes	No	No	N70p 3L Gore-Tex	Regular	590 g / 1 lb 4.8 oz	72.5 cm / 28.5 in	Yes
Sabre LT (Men's)	Skiing	7/10	8/10	7/10	8/10	N/A		Review	Yes	No	No	N80p 3L Gore-Tex	Regular	660 g / 1 lb 7.3 oz	83 cm / 32.5 in	Yes
Sentinel LT (Women's)	Skiing	7/10	8/10	7/10	8/10	N/A		Review	Yes	No	No	N80p 3L Gore-Tex	Regular	565 g / 1 lb 3.9 oz	73.5 cm / 29 in	Yes
Incendia (Women's)	Skiing	8/10	9/10	9/10	3/10	N/A		Review	Yes	No	No	NP100d 3L Gore-Tex	Trim	610 g / 1 lb 5.5 oz	79 cm / 31 in	Yes
Indencia IS	Skiing	No data	No data	No data	No data	No data			Yes	No	No	N80p 2L Gore-Tex	Regular	?	78 cm / 30.75 in	Yes
Squamish (Men's - Women's)	Running	5/10	4/10	7/10	9/10	N/A	Go-to running jacket.	Review	No	No	Yes	30D Tyono	Trim	140 g / 4.9 oz	77.5 cm / 30.5 in	No
Norvan Windshell (Men's - Women's)	Running	No data	No data	No data	No data	N/A			No	No	Yes	Permeair 20	Trim	90 g / 3.2 oz	73 cm / 28.75 in	No
Norvan Shell (Men's - Women's)	Running	No data	No data	No data	No data	N/A			No	No	No	13D 3L Gore-Tex	Trim	190 g / 6.7 oz	73 cm / 28.75 in	No
Nodin (Women's)	Running	8/10	5/10	5/10	10/10	N/A			No	No	Yes	20D Tyono	Trim	130 g / 4.6 oz	75 cm / 29.5 in	No
Incendo Airshell (Women's)	Running	No data	No data	No data	No data	N/A			No	No	Yes	?	Trim	105 g / 3.7 oz	?	No
Incendo (Men's)	Running	7/10	4/10	5/10	10/10	N/A		Review	No	No	Yes	Lumin	Trim	125 g / 4.4 oz	?	Yes
Norvan LT (Men's - Women's)	Running	5/10	5/10	8/10	6/10	N/A			No	No	No	N13p 3L Gore-Tex	Trim	190 g / 6.7 oz	?	Yes
Norvan SL Ins. (Women's)	Running	No data	No data	No data	No data	39/4			No	No	Yes	Gore-Tex ShakeDry	Trim	270 g / 9.5 oz	71.5 cm / 28.1 in	Yes
Cita (Women's)	Running	7/10	4/10	5/10	10/10	N/A		Review	No	No	Yes	Lumin	Trim	120 g / 4.2 oz	67.5 cm / 26.5 in	Yes
Cita SL (Women's)	Running	7/10	4/10	4/10	10/10	N/A		Review	Yes	No	Yes	Permeair 20	Trim	65 g / 2.3 oz	61.5 cm / 24.2 in	Yes
Incendo SL (Men's)	Running	7/10	4/10	4/10	10/10	N/A		Review	No	No	Yes	Permair 20 & Canim	Trim	80 g / 2.8 oz	73 cm / 28.75 in	Yes
Norvan SL (Men's - Women's)	Running	7/10	6/10	8/10	8/10	N/A		Review	No	No	Yes	Gore-Tex Infinium	Trim	120 g / 4.2 oz	77 cm / 30.4 in	Yes
Trino SL (Men's)	Running	8/10	5/10	7/10	6/10	N/A		Review	No	No	No	Gore-Tex Infinium	Trim	340 g / 12 oz	74 cm / 29.1 in	Yes
Trino SL Anorak (Women's)	Running	8/10	7/10	8/10	7/10	N/A		Review	No	No	No	Gore-Tex Infinium	Trim	290 g / 10.2 oz	65 cm / 25.5 in	Yes
Solano (Women's)	Around Town	No data	No data	No data	No data	N/A		Review	No	No	No	Gore-Tex Infinium	Relaxed	355 g / 12.5 oz	72 cm / 28.3 in	No
Venda Anorak (Women's)	Around Town	No data	No data	No data	No data	N/A			No	No	No	Gore-Tex	Relaxed	255 g / 9 oz	75.5 cm / 29.7 in	Yes
Zeta FL (Men's - Women's)	Hiking	4/10	6/10	4/10	6/10	N/A			No	No	No	N20r 2L Gore-Tex	Trim	221 g / 7.8 oz	76 cm / 30 in	Yes
Zeta SL (Men's - Women's)	Hiking	3/10	5/10	4/10	5/10	N/A		Review	No	No	No	2L Gore-Tex	Trim	310 g / 10.9 oz	77.8 cm / 30.6 in	Yes
Zeta LT (Men's - Women's)	Hiking	5/10	7/10	8/10	5/10	N/A			No	No	No	N40P-X 3L Gore-Tex	Trim	335 g / 11.8 oz	78 cm / 30.75 in	Yes
Zeta AR (Men's)	Hiking	7/10	8/10	7/10	4/10	N/A			Yes	No	No	3L Gore-Tex	Regular	425 g / 15 oz	80 cm / 31.5 in	Yes

Performance data axis of synthetic jackets (table above) and shell jackets (this table) are different. Don't compare them.

REI is on a rare sale. Don't miss. Patagonia's are like up to 70% off...
- https://www.rei.com/h/deals

Not only the insulation filament used in Dually Belay is premium, but also the amount of this insulation is generous (92 g/m²).

And even this is not the end point for this parka in terms warmth.

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Just dropped

Macai Shell: https://arcteryx.com/us/en/shop/mens/macai-shell-jacket
Nita: https://arcteryx.com/us/en/shop/womens/nita-down-jacket
Epsilon: https://arcteryx.com/us/en/shop/mens/epsilon-insulated-hoody
Cerium Pants (yes, seriously): https://arcteryx.com/us/en/shop/mens/cerium-pant
Liatris: https://arcteryx.com/us/en/shop/womens/liatris-down-jacket
Thorium SV: https://arcteryx.com/us/en/shop/mens/thorium-sv-hoody
Proton Heavyweight: https://arcteryx.com/us/en/shop/mens/proton-heavyweight-hoody
Atom Shacket: https://arcteryx.com/us/en/shop/womens/atom-shacket
New Nano Air: https://patagonia.com/product/mens-nano-air-insulated-hoody/84367.html

In addition to all these, the abundant insulation material used in the Dually Belay is spread through not one but two layers.

Must see before making up your mind: Jacket Finder tool at arcteryx.com

If you're familiar with my post about the working principles of insulated jackets, then you already know that this is a huge advantage for warmth. Because the air trapped in between the layers is also leveraged to work as an extra layer of insulation.

If you paid enough attention to your Thermodynamics class in school, then you already know what I'm talking about. Air makes up a perfect insulation material.

Fit

I'm 5'11", 165 lbs, athletic build. Size M fits me perfectly.

My size is always the same. Arc'teryx, Patagonia, TNF, Salomon, Columbia, Nike, Adidas, Under Armour, Zara... Doesn't matter.

Arc'teryx's 2024 men's fit revision

Straight from arcteryx.com on what's changed:

Source: https://arcteryx.com/us/en/help/sizing/mens/tops/new

Not all jackets come with revised fit. Only the ones with following statement.

Poll

Poll

Being able to trap air between the two layers, Dually Belay leverages this very advantage of using the air as extra insulation. An important advantage which (to my knowledge) no other jacket can achieve on their own due to their single layered structure.

This is actually also the primary advantage of layering, and the reason why it's praised by outdoor enthusiasts so much.

One of the most important upsides to layering is the advantage of being able to trap air between the layers, have that air heated by your body, and ultimately leverage that air as extra insulation.

This is a great extra warmth with no costs (such as extra weight).

To summarize...

Dually Belay is... WARM. Mind you, though, if you're like most people, for temperatures over 20 deg F (-7 deg C), it can even be TOO WARM for most of you!

Weather Resistance

Dually Belay is equipped with 30 denier nylon face fabric. This is quite a bit wind and water proof, although not as waterproof as another similar Arc'teryx jacket Fission SV (more on this later).

Dually Belay is made in Canada!

It's one of very few Arc'teryx jackets made in outside Asia.

See the manufacturing locations for all Arc'teryx jackets here: https://outdoorcrunch.com/where-is-arcteryx-made/

Dually Belay is also DWR coated.

What is DWR by the way?

DWR is a coating.

It's basically sprayed on to the surface of these jackets as a finish.

It stands for Durable Water Repellent - which means that water will be repelled under wet conditions instead of soaking into the fabric.

DWR also decreases dry time.

It's a good thing these jackets are coated in DWR.

But pay attention to the fact that DWR is a coating - meaning that it will wear off over time.

Which is why you might want to invest in a DWR spray such as this one at arcteryx.com for after treatment.

As you see, there's a strong correlation between FP x FW and temperature ratings, but not more than, say, 80%. I explained why this happens here in this post of mine.

In summary, I'd highly doubt you'll experience any problems in terms of water and wind resistance inside this jacket. Synthetic insulated jackets are known for being very resistant to wet weather conditions.

Alternatives

There's only one TRUE alternative to Dually Belay Parka, and it's the Fission SV (Men's - Women's - read my review).

I evaluated Fission SV's temperature rating as well, and found it to be 3 deg F (-16 deg C). Whereas that of Dually Belay is lower at 0 deg F (-18 deg C), as mentioned earlier in this post.

As you see, Fission SV still very warm, though it isn't as warm as Dually Belay.

Must see before making up your mind: Jacket Finder tool at arcteryx.com

Now although the Fission SV isn't as warm as the Dually Belay (as you see), it does get ahead of Dually Belay in one department: Waterproofing. Fission SV is noticeably more waterproof than the Dually Belay.

In fact, it's the warmest fully waterproof Arc'teryx jacket.

Another advantage of Fission SV is that it's also offered in women's specific counterpart, unlike Dually Belay which is only offered for men.

Here's the product video for Dually Belay Parka: