FEATURES of the Sorel Men’s 1964 Premium T CVS Boot Upper: Waterproof waxed canvas upper. Seam sealed waterproof construction Insulation: Removable 9 mm recycled felt inner boot Midsole: 2.5 mm bonded felt frost plug Outsole: Handcrafted waterproof vulcanized rubber shell with herringbone outsole SPECIFICATIONS of the Sorel Men’s 1964 Premium T CVS Boot Weight: 22 oz / 623 g Temperature Rating: -40° F / -40° C