Comfy and cosy waterproof winter boots Snow days are more fun in these cosy winter boots with a waterproof finish and removable felt liner with sherpa pile snow cuff to keep them warm and dry. Upper: Waterproof PU coated leather upper. Seam-sealed waterproof construction. Laces are not waterproof. 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 SOREL aero-trac nonloading outsole.