FEATURES of the Sorel Men’s 1964 Pac Nylon Boot Upper: Waterproof backed synthetic textile and PU coated D-ring anchors. Seam sealed waterproof construction Insulation: Removable 9 mm washable recycled felt inner boot with Sherpa Pile snow cuff Midsole: 2.5 mm bonded felt frost plug Outsole: Handcrafted waterproof vulcanized rubber shell with herringbone outsole SPECIFICATIONS of the Sorel Men’s 1964 Pac Nylon Boot Weight: 24 oz / 680 g Temperature Rating: -40° F / -40° C