Perfect for cooler conditions, the 770 features 200 grams of Thinsulate insulation and a Gore-TexA(R) waterproof bootie which allows your feet to stay warm, dry and comfortable. Another special feature is the Vibram FIRE & ICE outsole used that is made of a special rubber compound that does not harden in cool temperatures to provide better traction in icy conditions. VANGUARD running shoe sole construction Durably waterproof and highly breathable GORE-TEX fabric 200g THINSULATE(TM) Insulation Specifications Height: 8" (Standard Military Height) Upper: 100% cattlehide leather & nylon fabric Midsole: Highly cushioned, shock absorbent midsole 100% rubber VIBRAM Sierra FIRE & ICE compound designed to improve traction in icy conditions Outsole: Single density molded removable insert