Northside Men's Bozeman Snow Boot Synthetic Synthetic sole Shaft measures approximately 10" from arch Platform measures approximately 0.75 Waterproof seamsealed leather upper with lightweight TRP shell bottom Top gaiter with toggle closure to keep the snow and cold out Compression molded EVA midsole provide lightweight comfort 11.5 inch Distressed leather upper with adjustable buckle strap and D-ring speed lacing Ultimate warmth with 600 grams of Thinsulate insulation for a -50 degree rating