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The Burton AK GORE-TEX 3L PRO Acamar Bibs are the real deal for riders who treat big mountains like their office. Built with PRO-grade durability and stretch that actually moves with you (not against you), these bibs handle heli runs, snowmobile approaches, and those marathon boot-pack days without complaining. GORE-TEX 3L breathability means you're not drowning in your own sweat while you're working, and the full bib coverage keeps snow and cold air where it belongs—outside, not down your back.
GORE-TEX RGD Pro Shell 3-Layer Nylon 80D Plain Weave
Upper Bib – 4-Way Stretch Nylon Double Weave
PFC-Free DWR
bluesign® Approved – bluesign® materials are responsibly crafted in manufacturing processes that manage natural resources efficiently, produce cleaner air and water emissions, and use only chemicals that are deemed safe for people and planet.
GORE-TEX PRO ePE – GORE-TEX PRO is GORE's most durable, waterproof, and breathable material is designed for outdoor professionals and the harshest weather. GORE-TEX fabric is GUARANTEED TO KEEP YOU DRY™.
Relaxed Fit – This looser fit offers plenty of room for ease of mobility, comfort, and layering.
Beacon-Friendly Power Mesh Pocket with Loop Inside Right and Left Thigh Pockets
Zippered Chest Pockets with Media Ports and Webbing Loops
Zippered Handwarmer Pockets with Expandable Bellow
External Chest Power Mesh Dump Pockets
Crossflow Venting™ Thigh Vents – Interior and exterior zippered vents.
[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.
RECCO® Reflector
Reinforced Ankle Kick Panels
Elasticized Adjustable Cuffs
Exterior Utility Loops
Adjustable Hook and Loop Suspenders
Kinetic Garment Construction
Triple Needle Reinforced Stitching
Zippered Drop-Seat Construction
YKK® Water Resistant Zippers
Fully Taped Seams
GORE-TEX believes they have a responsibility to help find solutions that lead to a better tomorrow. The ePE (expanded polyethylene) membrane in new GORE‑TEX products is a key milestone in their responsible performance journey, providing high-performing, durable products that are engineered for long product life. The all-new GORE‑TEX ePE membrane is light and thin, yet strong, and it's PFC free with a reduced carbon footprint.
| Breathability Rating (g) | Breathability Level | Activity Level |
| 0 - 10000 | Low to moderate breathability | Resort skiing & snowboarding / walking / low intensity activity |
| 11000 - 15000 | Moderate breathability | Resort skiing & snowboarding / hiking / moderate intensity activity |
| 16000 - 20000 | High breathability | Backcountry skiing & snowboarding / backpacking / moderate to high intensity activity |
| 21000+ | Very high breathability | Backcountry skiing & snowboarding / biking / high intensity activity |
| Warmth | Description | Ideal Conditions |
| Uninsulated (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° |