840 denier polyester polyester upper fabric with waterproof membrane; 4 mm polyurethane foam insulation for additional warmth; 2.5 mm polyurethane internal bootie; 15" height, extends to 20" with gaiter; Glacier Trek SPK outsole with replaceable Stainless Steel Hardened Spikes; Cleat wrench included (located in internal pocket); Duraflex quick-release closure with adjustable hook-and-loop strap system; Comfort rating of -29degC; Fits orthopedic footwear; Weight: 3.3 lbs