Heavily insulated with 600 grams of Thinsulate(TM), this all full-grain leather boot offers ultimate waterproof protection and superior slip resistance in icy conditions through the use of the VibramA(R) 360Adeg FIRE & ICE(TM) outsole made of a special rubber compound that will not harden in cold temperatures. Belleville Gore-Tex boots run about 1/2 size larger than your running shoe. For example, if you wear a size 10, consider trying a size 9.5. 600g THINSULATE Insulation Durably waterproof and highly breathable GORE-TEX fabric VANGUARD running shoe sole construction AR-670-1 Compliant Specifications Height: 8" (Standard Military Height) Upper: All 100% cattlehide leather Midsole: Highly cushioned, shock absorbent midsole Outsole: 100% rubber VIBRAM 360 FIRE & ICE compound designed to improve traction in icy conditions Insole: Single density molded removable insert