Sorel size 7 winter boots INSULATION: Removable 6 mm washable recycled felt inner boot. MIDSOLE: 2.5 mm bonded felt frost plug. OUTSOLE: Handcrafted waterproof vulcanized rubber shell with herringbone outsole. HEEL HEIGHT: 1 1/2 in. PLATFORM HEIGHT: 3/4 in. SHAFT HEIGHT: 12 in. LACE LENGTH: 52 in. Please note: Laces and zippers incorporated in SOREL footwear are not waterproof. Measurements based on size 7. Uses: Heavy Snow