From Sorel, the Men's Caribou™ Waterproof Cold Weather Boots feature: Waterproof nubuck upper. Seam-sealed waterproof construction.  lace-up. Please note: Laces and zippers incorporated in SOREL footwear are not waterproof. Removable 9 mm washable recycled felt inner boot with Sherpa pile snow cuff. 2.5 mm bonded midsole felt frost plug. Handcrafted waterproof vulcanized rubber shell with Sorel aero-trac non loading outsole Approx 9.25" shaft height approx. 50" lace length Uses: Heavy Snow Imported.