With a premium feel and construction that shows attention to detail, the Mammut Stoney HS jacket is one of the best hard shell ski jackets we've tested this winter.
The Mammut Stoney HS jacket is the brand’s best-selling hooded ski jacket and has been for a number of seasons. The fall 2024 version received a complete overhaul, including fabrics, construction, and features. We think the Mammut Stoney HS is one of the most thoughtfully designed ski jackets we’ve tested for winter 2024-2025.
https://outdoorcrunch.com/mammut-stoney-hs-pant/
Pros
- Mammut DRY Tour fabric - Has a great hand (feel), and we've found it to be reliably durable against abrasion. Click here for a great info page from Mammut on their DRY Tour fabric.
- Thoughtful design for days on the slopes
- Wrist gaiters prevent snow from sneaking in through the cuff and are silky smooth.
- The hood has an incorporated mesh visor, which helps it stay locked into place on your helmet.
- The snow skirt (powder skirt) is fully detachable.
Cons
- Only 15,000mm waterproof rating - While we've stayed fully dry in our testing, we'd still like to see a ski shell have a 20,000mm+ rating for long days in the elements.
- The main zipper - Two-way water-repellent zippers are often frustrating to operate. We've had issues when zipping this one closed. It takes extra care to make sure the zipper is properly aligned at the entry point.
Mammut Stoney HS Jacket
Mammut Stoney HS women's jacket in Glacier Blue
Mammut Stoney HS men's jacket in Glacier Blue-Black
Mammut Stoney HS Jacket Fabrics
The Mammut DRY Tour fabric on the Mammut Stoney HS jacket is developed in house and primarily made from recycled polyester. It features a 3-layer construction for protection against water while offering breathability. The fabric is not nearly as crinkly as a typical hard shell and also has stretch to adapt to movement. In terms of softness and comfort, this face fabric stands out against the multitudes of jackets we've tested.
The Mammut DRY Tour fabric used in the Stoney HS is primarily a 75-denier recycled polyester. While not expedition-grade, it provides sufficient abrasion resistance for freeriding, resort use, and ski touring. The materials strike a perfect balance between durability and feel.
Check out this great page from Mammut giving more detail on Mammut DRY Tour:
https://www.mammut.com/us/en/mammut-dry-tour
Water Resistance and Breathability
Water resistance
The Mammut Stoney HS has a PFC-free durable water repellent (DWR) coating on the fabric. This, in combination with the Mammut DRY Tour fabric, results in a waterproof rating of 15,000mm. This is on the low end for a true freeride ski jacket.
There are two things to keep in mind with this assessment. First, there needs to be a balance between weatherproofing and breathability. It could be that a higher DWR on this application of the Mammut DRY Tour would sacrifice some breathability, which would be a shame because this jackets has fantastic breathability. The other thing to realize is that we've tested this jacket in wet snow on a few occasions and had no problem staying dry. What we still need to do is subject it to a full day with inclement weather to see how it holds up after hours of exposure to precipitation.
For comparison, the Stio Environ jacket has a 20,000mm waterproof rating, falling into the class of hard shell that Stio refers to as "Peak Proof." Stio also has a great guide to features of a waterproof ski jacket.
This table from Evo provides a good overview of generally accepted guidelines for waterproof ratings.
| Rating | Conditions |
|---|---|
| 0-5,000mm | Light rain, dry snow, no pressure |
| 6,000-10,000mm | Light rain, average snow, light pressure |
| 11,000-15,000mm | Moderate rain, average snow, light pressure |
| 16,000-20,000mm | Heavy rain, wet snow, some pressure. Think PNW. |
| 20,000mm + | Heavy rain, wet snow, high pressure |
Rating (mm) | Water Resistance provided | Conditions |
|---|---|---|
0-5,000m | No resistance to some resistance to moisture | Light rain, dry snow, no pressure |
6,000-10,000mm | Rainproof and waterproof under light pressure | Light rain, average snow, light pressure |
11,000-15,000mm | Rainproof and waterproof except under high pressure | Moderate rain, average snow, light pressure |
16,000-20,000mm | Rainproof and waterproof under high pressure | Heavy rain, wet snow, some pressure. Think PNW. |
20,000 mm+ | Rainproof and waterproof under very high pressure | Heavy rain, wet snow, high pressure |
Breathability
Mammut expresses breathability as the amount of water vapor (in grams) that can pass through a square meter of fabric in a day (g/m2/24h). Using this method, a higher value means the jacket is more breathable.
- <5,000g/m2/24h - Suitable for light activity
- <15,000g/m2/24h - Suitable for moderate activity
- >15,000g/m2/24h - Suitable for intense activity
The Mammut Stoney HS Jacket has a breathability rating of 20,000 g/m²/24h, which ensures that the inside of this jacket stays dry and comfortable even during high-output activity. On top of this there are massive x-vented underarm ventilation zippers, as well as a two-way zipper for your main zip (we have a love-hate relationship with these, which we'll cover).
The x-vent underarm ventilation are large and have 2-way zippers allowing for flexibility in how you vent.
Warmth & Insulation of the Mammut Stoney HS Jacket
The Mammut Stoney HS jacket is strictly a hard shell ski jacket and it is not insulated. We've skied in frigid temperature and stayed warm and well regulated using a couple of different midlayers under the Stoney.
Mammut also offers an insulated version of this jacket. Check out the Mammut Stoney HS Thermo Jacket here.
Here are a few of our favorite midlayers for skiing. All of these links are to non-hooded versions, which is what we recommend for wearing under a shell.
- Mammut Taiss Light ML: This is a versatile midlayer fleece with an athletic fit and a smooth face fabric specifically designed to wear under a hard shell. As a bonus, it looks great as an outer layer in cool weather.
- Patagonia Nano Puff Jacket: A perennial favorite that is versatile enough to also be your spring and fall jacket.
- Patagonia Nano Air Hybrid Jacket: A highly breathable midlayer that measures a touch warmer than the Nano Puff. We absolutely love the hooded version of this jacket and think the non-hooded is spot on as a midlayer for skiing and riding.
The Mammut Stoney HS should be paired with a midlayer for insulation. In this case, a Patagonia Nano Puff.
Fit & Feel of the Mammut Stoney HS Jacket
This is one of the softest, if not the softest, "hard" shell we've tested. It is a pleasure to wear. Details like fleece on the zipper flap by the chin show thoughtful design for cold weather. There are also wrist gaiters with soft elastic that make this jacket comfortable at the cuff, while keeping heat inside. The Mammut Stoney HS jacket rates very high for us in the comfort category.
As is pretty typical for a ski jacket, the Mammut Stoney HS fits pretty loose when you aren't fully kitted up. I find it too loose to wear with jeans as an around town shell. Mammut refers to this as their "ski regular fit."
You can find Mammut's full size and fit guide on the product page for the Stoney HS Jacket.
Women:
https://www.mammut.com/us/en/products/1010-31050-0001/stoney-hs-hooded-jacket-women
Men:
https://www.mammut.com/us/en/products/1010-31010-40294/stoney-hs-hooded-jacket-men
This a size medium jacket and pants. I'm 5' 9" and 150lbs.
The helmet-compatible hood is also very roomy. Even with my Smith Variant helmet, the hood has room to spare, and the adjustment points make it easy to cinch the hood in place. The Stoney HS hood also has a very unique feature to keep it from popping off your helmet. There is mesh with an elastic binding at the brow, which slides over the brim of your helmet. We've found that it works really well to keep the hood from riding up on your helmet.
The mesh band on the brow of the helmet helps keep the hood from riding up on your helmet.
The hood adjustment can be found even with gloves on.
We find the hood roomy even with a ski helmet, but the adjustability and brim mesh keep it in place.
Snow Skirt aka Powder Skirt
As a true ski jacket, the Mammut Stoney HS jacket has a snow skirt. We like that there are two sets of snaps to adjust tightness and make sure it fits. So many jackets have floppy, useless snow skirts for trimmer folks. Bonus points for the snow skirt being removable.
The Mammut Stoney HS jacket features a removable snow skirt.
Two sets of snaps allow for adjustability of the tightness on the snow skirt.
Pockets and zippers on the Mammut Stoney HS Jacket
This ski jacket has ample storage with seven pockets:
- RFID pass pocket on the left sleeve
- Two handwarmer pockets
- Two exterior chest pockets
- One interior dump pocket
- One interior chest pocket
The interior chest pocket is on the small side, which we find to be a good thing, primarily to keep your phone from sliding around while you shred. To further keep things in place, this pocket uses a stretch fabric.
All exterior zippers are water resistant. On the plus side, each has nice large rubber zipper pull, which makes them impressively functional while wearing gloves. Our biggest criticism of this jacket is the water-repellent VISLON® AquaGuard® two-way front zipper. We frequently had trouble properly seating the end of the zipper and closing it cleanly. Often, we ended up with the teeth misaligned and jammed, requiring a fair amount of force to undo. With some practice and intention when seating the zipper we are able to mostly avoid this. We're not sure the benefits of the 2-way zipper are worth the headache it causes.
The large rubber zipper pulls are one of the many details that Mammut got right for skiers.
Two-way zippers provide options for breathability and comfort when sitting, but we had issues operating this one.
All exterior pockets have water-repellent zippers.
The single dump pocket on the Mammut Stoney HS Jacket
Breeze through the lift line with your pass in the sleeve pocket.
The interior chest pocket is smaller than some and has stretch.
Heavy on features, comfort, and Swiss style, the Mammut Stoney HS is a great choice for anyone looking for a premium ski shell. We absolutely believe it deserves a spot near the top of your wish list for an all-around ski jacket this season.
Check out our other content on jackets:
Guide: Insulated & Shell Jackets
Start here:
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