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.