Helly Hansen Alpha 2.0 Insulated Ski Jacket Mens Polyamide Zipper closure 4" high 11" wide Helly Tech: Extremely waterproof and breathable designs. For highly aerobic extremely wet or unusually long-lasting activities in extreme conditions. Waterproofness and breathability ratings typically above 20,000mm and 20,000 g/24h/m^2 respectively. 85% Polyamide/15% Elastane