Sorel Yoot Pac Nylon . Whether packing snowballs or riding sleds, the Yoot Pac Nylon offers the waterproof warmth, durability, and comfort of a winter pac boot in a versatile, low-profile design. Removable felt liner with soft Sherpa Pile snow cuff. Seam-sealed waterproof construction. UPPER: Waterproof PU backed synthetic textile with PU coated leather overlays. INSULATION: Removable 9mm washable recycled felt innerboot with Sherpa Pile snow cuff. MIDSOLE: 25 mm bonded felt frost plug. OUTSOLE: Handcrafted vulcanized rubber with herringbone outsole. Weight: 18 oz / 510 g Measurements based on size 1. SOREL rated: -40? fahrenheit / -40? Celsius Imported.