Parkas

Arcteryx's Therme and Camosun are their second and third warmest parkas coming after the warmest Thorsen. All these jackets are designed for walking around town when it's freezing out (so called "line 24"). 

You can see this in Arc'teryx naming scheme at arcteryx.com as well. 

In summary, if the subject temperature range is mostly going to be somewhere between 0 - 15 deg F (-18 - -10 deg C), then both Therme and Camosun would be warm enough. Maybe also consider underlayer getting a good Arc'teryx base layer for more inclement days.

You'd probably overheat inside the Thorsen at these temperature ranges. So consider it for lower ranges: around 5 deg F (-15 deg C) and below.

Let's get to it. 

All 3 jackets use the same 750 fill power European goose down (which is top notch quality - read more about it here if you're curious). 

• Thorsen is equipped with the highest amount of down (192 grams) and hence the warmest. 
• Therme is the second warmest with 120 grams of down. 
• Camosun is the third - it has 105 grams of down.

For their exact warmth ratings, you can check out the chart below:

• Related Data Set: Estimated temperature ratings of Arc'teryx jackets

Here's the list of the lowest temperatures you can wear each Arc'teryx jacket without feeling uncomfortably cold. 

Keep in mind that these are only approximate values assuming:

• worn over a shirt only and no shell over,
• during daily use (strolls, power walks etc at most - no high output activities), 
• with light wind, 
• and when it's dry out.

Name	Est. Temp (F/C)	Insulation	Insulated	Review	Discontinued?	M-W
Arc'teryx Alpha Parka (Men's - Women's)	-17/-27	Down	Down		No	M
Feathered Friends Khumbu (Men's)	-17/-27	Down	Down		No	M
Arc'teryx Ceres SV (Men's - Women's)	-15/-26	Down	Down	Review	Yes	M
Mountain Equipment K7 (Men's - Women's)	-13/-25	Down	Down		No	M
Rab Positron Pro (Men's - Women's)	-13/-25	Down	Down		No	M W
Patagonia Grade VII (Men's)	-11/-24	Down	Down		No	M
Arc'teryx Firebee AR (Men's - Women's)	-10/-23	Down	Down	Review	Yes	M W
Mountain Equipment Exo (Men's)	-10/-23	Down	Down		No	M
Arc'teryx Thorsen (Men's)	-7/-22	Down	ParkaD	Review	No	M
Patagonia Frozen Range (Men's - Women's)	-6/-21	Down	ParkaD	Review	No	M W
Arc'teryx Centrale (Women's)	-5/-20	Down	ParkaD	Review	No	W
Rab Neutrino Pro (Men's - Women's)	-2/-19	Down	Down		No	M W
Arc'teryx Therme (Men's)	-2/-19	Down	ParkaD	Review	No	M
Arc'teryx Dually Belay (Men's)	0/-18	Synthetic	Synthetic	Review	Yes	M
Arc'teryx Camosun (Men's)	0/-18	Down	ParkaD	Review	No	M
Arc'teryx Piedmont (Men's)	2/-17	Down	ParkaD		No	M
Arc'teryx Fission SV (Men's - Women's)	3/-16	Synthetic	Synthetic	Review	No	M
Outdoor Research Super Alpine (Men's - Women's)	3/-16	Down	Down		No	M W
Patagonia Tres 3-in-1 (Men's - Women's)	3/-16	Down	ParkaD	Review	No	M W
Arc'teryx Radsten (Men's)	3/-16	Synthetic	ParkaS		No	M
Patagonia Fitz Roy (Men's - Women's)	3/-16	Down	Down		No	M W
Rab Electron Pro (Men's - Women's)	5/-15	Down	Down		No	M W
Arc'teryx Macai (Men's	5/-15	Down	Down	Review	No	M W
Arc'teryx Nuclei SV Parka (Men's - Women's)	5/-15	Synthetic	Synthetic		No	M W
Patagonia DAS Parka (Men's - Women's)	5/-15	Synthetic	ParkaS		No	M W
Arc'teryx Patera (Women's)	5/-15	Down	ParkaD	Review	No	W
Arc'teryx Cerium SV (Men's - Women's)	7/-14	Down	Down	Review	Yes	M W
Black Diamond Access Down (Men's - Women's)	7/-14	Down	Down		No	M W
Arc'teryx Kappa (Men's - Women's)	7/-14	Synthetic	Synthetic	Review	Yes	M
Arc'teryx Prema (Women's)	7/-14	Down	ParkaD		No	W
Arc'teryx Radsten Insulated Men's)	7/-14	Synthetic	ParkaS		No	M
Rab Microlight Alpine (Men's - Women's)	7/-14	Down	Down		No	M W
Patagonia Macro Puff (Men's - Women's)	8/-13	Synthetic	Synthetic	Review	No	M W
Feathered Friends Eos (Men's - Women's)	8/-13	Down	Down		No	M W
Arc'teryx Macai LT (Men's)	8/-13	Down	Down		No	M
Arc'teryx Seyla (Women's)	8/-13	Down	ParkaD		No	W
Arc'teryx Koda (Men's)	8/-13	Synthetic	ParkaS		No	M
Arc'teryx Thorium AR (Men's - Women's)	8/-13	Down	Down	Review	No	M W
Arc'teryx Kole (Men's - Women's)	10/-12	Down	ParkaD		No	W
Patagonia Vosque 3-in-1 (Women's)	10/-12	Synthetic	ParkaS	Review	No	W
Arc'teryx Alpha IS (Men's - Women's)	12/-11	Synthetic	Synthetic		Yes	M
Patagonia Jackson Glacier (Men's - Women's)	12/-11	Down	ParkaD	Review	No	M W
Arc'teryx Sensa (Women's)	14/-10	Synthetic	ParkaS		No	W
Patagonia Hi Loft Down (Men's - Women's )	14/-10	Down	Down	Review	No	M
REI Magma 850 Hoodie 2.0 (Men's - Women's)	14/-10	Down	Down		No	M W
Arc'teryx Atom AR (Men's - Women's)	18/-8	Synthetic	Synthetic	Review	No	M W
Patagonia Downdrift (Men's - Women's)	18/-8	Down	Down		No	M W
Patagonia Down Sweater (Men's - Women's)	19/-7	Down	Down	Review	No	M W
Arc'teryx Magnus (Men's)	19/-7	Synthetic	ParkaS		No	M
Arc'teryx Agrium (Men's - Women's)	21/-6	Down	Down		No	M W
Patagonia AlpLight Down (Men's - Women's)	21/-6	Down	Down		No	M W
Patagonia Topley (Men's)	23/-5	Down	Down		No	M
Rab Xenon 2.0 (Men's - Women's)	23/-5	Synthetic	Synthetic		No	M W
Patagonia Silent Down (Men's - Women's)	26/-3	Down	Down	Review	No	M W
Mountain Hardwear Ghost Whisp/2 (Men's - Women's)	28/-2	Down	Down		No	M W
Arc'teryx Cerium LT (Men's - Women's)	28/-2	Down	Down	Review	No	M W
Arc'teryx Nuclei FL (Men's - Women's)	32/0	Synthetic	Synthetic	Review	No	M W
Patagonia City Storm Down (Men's)	32/0	Down	ParkaD		No	M
Arc'teryx Atom LT (Men's - Women's)	36/2	Synthetic	Synthetic	Review	No	M W
Patagonia Micro Puff (Men's - Women's)	36/2	Synthetic	Synthetic	Review	No	M W
Patagonia Isthmus (Men's	36/2	Synthetic	ParkaS		No	M
Arc'teryx Proton LT (Men's - Women's)	37/3	Synthetic	Synthetic	Review	No	M W
Patagonia Nano Puff (Men's - Women's)	37/3	Synthetic	Synthetic	Review	No	M W
Arc'teryx Norvan SL Ins. (Men's - Women's)	39/4	Synthetic	Synthetic		Yes	M W
Patagonia Nano Air (Men's - Women's)	41/5	Synthetic	Synthetic	Review	No	M W
Arc'teryx Cerium SL (Men's - Women's)	43/6	Down	Down	Review	No	M W
Arc'teryx Proton FL (Men's - Women's)	48/9	Synthetic	Synthetic	Review	No	M W
Arc'teryx Atom SL (Men's - Women's)	52/11	Synthetic	Synthetic	Review	Yes	M W
The North Face Summit Down (Men's - Women's)	Testing	Down	Down		No	M W
Mountain Equipment Lightline Echo (Men's)	Testing	Down	Down		No	M
Mountain Equipment Kryos (Men's - Women's)	Testing	Down	Down		No	M W
Mountain Equipment Xeros (Men's - Women's)	Testing	Down	Down		No	M
Arc'teryx Andra LT IS (Women's)	Testing	Synthetic	ParkaS		No	W
Arc'teryx Phoria IS (Women's)	Testing	Synthetic	ParkaS		No	W
Feathered Friends Helios (Men's)	Testing	Down	Down		No	M
Feathered Friends Volant (Men's)	Testing	Down	Down		No	M
Rab Axion Pro (Men's - Women's)	Testing	Down	Down		No	M W
Feathered Friends Rock & Ice (Men's)	Testing	Down	Down		No	M
Rab Valiance (Men's - Women's)	Testing	Down	Down		No	M W
Rab Expedition 8000 (Men's)	Testing	Down	Down		No	M
Rab Zero G (Men's)	Testing	Down	Down		No	M
Rab Generator Alpine (Men's)	Testing	Synthetic	Synthetic		No	M
UBR Regulator Parka II (Men's)	Testing	Synthetic	ParkaS		No	M
Helly Hansen LifaLoft (Men's - Women's)	Testing	Synthetic	Synthetic		No	M
Mammut Eigerjoch (Men's - Women's)	Testing	Synthetic	Synthetic		No	M W
Helly Hansen Lumines (Men's - Women's)	Unknown	Synthetic	Synthetic		No	M
Haglofs V Series Mimic (Men's - Women's)	Unknown	Synthetic	Synthetic		No	M W
Black Diamond First Light (Men's - Women's)	Unknown	Synthetic	Synthetic		No	M W

Liked this table? 

If you did, check out this post of mine to see more Arc'teryx tables like this one, such as fill details for all down jackets. 

Also... 

• Thorsen has the longest hemline (36 inches), falls almost to the knees. 
• Therme is a bit shorter at mid thigh (33 inches), and it comes with a boxier "relaxed" fit which is called "regular fit". 
• Camosun is the shortest (31.5 inches) - just a bit lower than waist. It has the trimmest fitting. 

They're all equipped with Gore-Tex, so the wind is 100% blocked. 

So what should you consider when getting either one of these jackets?

If the lowest temperature you'll face won't be much colder than 15 deg F (-10 deg C)

In other words, if you'll be in Milwaukee, Toronto, Chicago, Cleveland, Detroit, Boston, NYC, or any other similar temperature range city; then both Therme and Camosun would feel warm enough for around 90% of the winter.

For the remainder of the winter, you can easily use another simple fleece underneath either of these jackets. And I don't mean something high-quality like Arc'teryx either, even a t-shirt + hoody combo would work.

Therme and Camosun: Warmth difference

The difference is minimal, but not non-existent. If you feel fairly cold inside a Camosun, I'd doubt Therme would solve your warmth problems in the same setting. But still, there are things you'd better consider.

I put together the things you should consider regarding the warmth differences between these two jackets under 3 main subheadings.

1-Easier layering

Compared to Therme, the Camosun is going to be more restrictive when you're trying to layer due to its trimmer fit. It might feel less comfortable if you try layering with a bulky synthetic insulated jacket beneath, such as Atom AR.

2-More down

Part of the extra down in Therme (120 vs 105 grams) you see in the product specs results from Therme's 1.5 inch longer hemline. It naturally requires more down. It'll cover a larger portion of your hips - which can be especially important if you don't have or aren't planning to get insulated pants.

Also, even when you ignore the Therme's extra hem length, it still uses a little bit more down than the Camosun - hence a bit more warmth.

3- Traps more air

Baggier cut doesn't necessarily mean that it'll provide more insulation than a more snug cut in every situation. It's contextual and depends on many factors such as how baggy or snug the jackets are, their fill quality (fill power), lengths etc.

But in our case, Therme isn't too baggy to let the air circulate too much and hence let the cold air in. It doesn't use a lower quality fill either.

So, since more insulation is always achieved by trapping more "heated" air, in the end, Therme provides a bit more warmth. 

As you see, the warmth difference is there, but it isn't as big to make you pretty much ignore other stuff. I'd pay at least as much attention to style, hood and personal layering needs. 

I'd recommend you to check out my Therme Parka review as well. 

Style

If you're fit or thin, Camosun's trimmer cut might look better on you. 

Baggier cut of Therme benefits you in warmth, as I explained earlier in this post, and this is how the baggier cut looks:

Proceed at your own taste...

Hood

Camosun's hood is detachable (separate hood) and that of Therme's isn't (integrated hood). This difference in hood construction naturally causes their collar configurations to differ as well. 

Camosun's collar is always up, whereas for the Therme the hood should be in use for collar to be standing up straight.

Higher collar is typically expected to block more wind, and I'm not saying this is incorrect. But even when the Therme's hood isn't in use (e.g collar isn't standing), you can still zip it upwards and raise it to a position that's as high as that of the Camosun's:

Still, though, it won't feel as comfortable as the Camosun's collar. This is why they're both equally great in terms of blocking wind when the hood isn't in use, but Camosun is more comfortable.

On the other hand, when you need more wind protection, Therme's collar will reach up higher when the hood is in use:

If you can picture some situations where you'd prefer the hood removed, then that obviously is going to be an another advantage for the Camosun.

What about the Outer Shell Differences?

Thorsen offers a 90D, Therme a 75D and Camosun a whooping 150D outer shell fabric. 

This means that the Camosun will feel burliest and Therme the smoothest in your hands. But most importantly, all of them are very durable.

Why does Arc'teryx's site state windproof for Therme and not for Camosun?

Product information on Arcteryx's site is often misleading. I can give you a thousand examples, but even in our current case you can see that the Coreloft density is left unfilled for the Therme. It is, however, equipped with it.

For windproof; all Camosun, Therme and Thorsen jackets are 100% windproof because of their high quality Gore-Tex membrane. There's nothing you should worry about.

That's all you should know about the Therme and Camosun so far.

Now enter my friend Thorsen - and let's get to its review.

It's important to note that the Thorsen would probably come too warm for the above temperature range and set-up. Vast majority of people would likely overheat in it (unless they run quite cold). Because it's designed for freezing temperatures.

...so if you'll be facing a considerable amount of colder days

Say, if you'll be facing as low as 5 deg F (-15 deg C) and below (Montreal, etc), then I'd recommend getting either:

1. Therme or Camosun (but probably Therme - read below paragraph) AND a good fleece under (such as this one of Arc'teryx) for extra layering (Therme and Camosun alone probably wouldn't be enough to keep you very warm at this cold),
2. The Thorsen (this color is really liked by many - including me).

If you choose to go with option #1, again, it's good to note that Camosun is going to be more restrictive in this situation due to its trimmer fit. I'd probably get the Therme and reap the extra warmth benefits as well.

Although the temperature differences between the Therme and Camosun are minimal, this isn't the case for Thorsen. It's significantly warmer than both of these jackets.

For the vast majority of people, even if you layer Therme or Camosun with another synthetic insulated jacket (such as one of these) they still won't feel as warm as Thorsen by itself.

This is actually stated by the Arc'teryx staff themselves:

In short, if you want to maximize warmth, Thorsen is the way to go for you. But if you have more $$$ to spare, then layering would give you more versatility. Proceed with your personal needs and desires.

Lastly, all these jackets are DWR coated - which means that they repel water just fine.

Closing

If you're interested, here are the product videos: