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The Burton AK Helium Stretch Insulated Fragment Pant delivers Hiroshi Fujiwara's signature stealth aesthetic with breathable stretch comfort that makes the difference on the coldest mountain days, while versatile styling transitions naturally from backcountry to cityscape. With construction so comfortable you'll find excuses to wear them beyond riding.
High CFM Super Stretch Fabric
bluesign® Approved
40g Thermacore Stretch
Regular Fit
Zippered Handwarmer Pockets
Zippered Back Pocket
[ak] x FRAGMENT – A limited edition Hiroshi Fujiwara collab brings a stealth theme to the pro-grade Acamar Bibs. Made to handle the demands of big mountain descents, heli-snowboarding, snowmobiling, and hardworking snow pros, they are part of your big mountain guide-level kit with the durability, stretch, and breathability to keep you riding day in and day out. They're packed with all the bells and whistles that keep you comfortable and your stuff close at hand, no matter the conditions. Durability, storm protection, and freedom of movement at their best.
Stretch Binding at Cuffs
Elasticized Waistband with Internal Draw String Cinch
Reflective Details
YKK® Zippers
| Warmth | Description | Ideal Conditions |
| Shell | Outer shell with no insulation. Pair with base layers and mid layers to fine tune the level of warmth required. | Variable |
| Warm | Light insulation. Use additional base or mid layers to add warmth when temperatures drop. | 20° - 35° |
| Warmer | Moderate insulation. Suitable for cold conditions. | 10° - 25° |
| Warmest | Heavy insulation. Designed to keep you comfortable and protected on the coldest days. | Below 15° |