The only altitude sickness you'll get in the Burton AK 2L Altitude Jacket will be a symptom of sending sick lines. A specifically-designed [ak] articulated fit will make layering easy without unnecessary folds of fabric, and YKK® zippers add trusty water-resistance so you can store your essentials with good conscience. Reliable GORE-TEX® 2-layer fabric and responsible bluesign®-approved construction of the Burton AK 2L Altitude Jacket will help you write the stuff of legends on the slopes, rain or shine. Product Details Face Fabric Bluesign® Approved GORE-TEX® Fabric Membrane GORE-TEX® Waterproof Breathable Membrane – "Guaranteed to Keep You Dry."® Lining Material Shell Mapped with Taffeta and Closed Cell Mesh Lining Fit [ak] Fit w/ Engineered Articulation – A performance oriented, articulated fit with cutlines and patterning engineered to mimic the body's natural flex while riding and hiking. The result is a higher degree of mobility that enhances the function-first design and style of [ak]. Pockets Zippered Chest Pocket Additional Features Fully Taped Seams w/ GORE-SEAM® Tape – GORE-SEAM® Tape minimizes seam tape in critical zones, reducing the shell's overall weight and bulk while increasing the breathable surface area. YKK® Matte Water-Resistant Zippers Water-Repellent Removable Waist Gaiter Jacket-to-Pant Interface