Mammut Stoney HS Ski Pant Review

The Mammut Stoney HS Pant is a premium ski and snowboard pant. It has a uniquely soft fabric and specific features for hitting the slopes.

The Mammut Stoney HS Pant is part of the brand's best selling Stoney series. The fall 2024 version received a complete overhaul including fabrics, construction, and features. We think both the Stoney HS pant and jacket are some of the most thoughtfully designed ski outerwear we’ve tested for winter 2024-2025. 

Pros

• Mammut DRY Tour fabric - Has a great hand (feel) while being sufficiently durable against abrasion. Click here for a great info page from Mammut on their DRY Tour fabric.
• Thoughtful design for days on the slopes
  • Exterior waist adjustment
  • Thigh vents
  • Cordura™ edge protection panels
  • Ankle snaps to prevent trampling your pants when not in ski or snowboard boots

Cons

• Only 15,000mm waterproof rating - While we've stayed fully dry in our testing, we'd still like to see a ski pant have a 20,000mm or higher rating for long days in the elements.
• No hooks on the gaiters - The gaiters have rubber grippers but lack hooks for attaching to your boot's buckles or laces.
• No bib option  - We'd love to see these also offered as an overall.

Mammut Stoney HS Pant Fabrics

Like the jacket, Mammut Stoney HS pant uses Mammut DRY Tour fabric. This material is developed in house and features a 3-layer construction for protection against water while offering commendable breathability. The fabric is not nearly as crinkly as a typical hard shell and also has nice stretch to adapt to movement.

The face fabric stands out against the multitudes of other jackets and pants we've tested in terms of softness. The Mammut DRY Tour fabric used in the Stoney HS pant 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. 

The standard version of the Mammut Stoney HS pant is not insulated. The merino-insulated Trift tight (men's / women's) is a great option to keep you warm and regulated. If you prefer an insulated pant and jacket, Mammut offers the Stoney series with synthetic insulation.

Water Resistance and Breathability

Water resistance

On the Stoney HS pant's face fabric is a PFC-free durable water repellent (DWR) coating, giving this pant a waterproof rating of 15,000mm. This is on the low end for true freeride gear. That said, I've skied in wet snow at Copper Mountain in Colorado and had no issue staying dry.

Breathability

The Mammut DRY Tour fabric transfers moisture very well, with a breathability rating of 20,000 g/m²/24h, which ensures that the inside of the Mammut Stoney HS pant stays dry and comfortable even when you're working hard. Anything 15,000g/m²/24h and above is suitable for intense activity.

See our Mammut Stoney HS Jacket article for more details on waterproof and breathability ratings.

For even more regulation there are 10.5-inch (27 cm) zippered vents on each leg. There are many different approaches to vents on ski pants, and I like the simplicity of the vents on the Stoney HS. This is all that is needed to let heat escape. I find that even with more zipper I tend to only open vents at most to what Mammut is offering here.

Features of the Mammut Stoney HS Pant

Here are some details of these pants that tailor their use for skiing and snowboarding.

Adjustable waist

These pants have hook-and-loop external adjustment at the waist, so no belt needed. This is a welcome feature, as I find that I loosen or tighten depending on layers as well as letting them out a little when it's time for apres beverages.

Pockets

The Stoney HS pants feature two gusseted front pockets for storage. The right pocket has a tether for your keys.

Cordura™ edge protection panels

On the inside of each ankle you'll find an extra layer of protection to make sure your pants stand up to seasons of abuse and don't end up with tears from the edges of your skis. I like that these panels are light and not overly stiff.

Snaps to tighten the cuff

As someone who routinely rolls up their ski pants when not wearing my boots, I love this feature of the Stoney HS pants. These pants offers snaps at the cuffs that allow you to reduce the size of the opening. This ensures you don't end up trampling and destroying the ends of your pants. 

Gaiters

The gaiters are adequate, but one of my few complaints about the Stoney HS pants are that there are not hooks included. I think full-featured pants for snow should have hooks on the gaiters to attach to your buckles or laces. If you step off of your board or out of your skis into deep snow, hooks ensure the gaiter stays in place and doesn't ride up your leg, leaving you with snow in your boot. The gaiters on the Stoney HS pants have rubber grippers on the elastic binding, which is adequate for normal use clipped in. I'd be more confident trudging through powder if they also had hooks.

Concluding thoughts on the Mammut Stoney HS Pant

This is a great looking pair of pants that uses a premium fabric. Mammut's attention to detail - like the snaps on the cuffs - shows that their designers spend ample time on snow. The lack of hooks on the gaiters is a rare oversight on these pants. I like these so much that I wish they also offered a bib version. Regardless, the Mammut Stoney HS Pant is a standout model for winter 2024-2025.