Sorel 1964 PAC NYLON men's Snow boots in Black Leather, Available in men's sizes. 12. UPPER: Waterproof nylon upper. Waterproof construction with waterproof seams. INSULATION: 9mm recycled felt inner liner. MIDSOLE: Anti-freeze insert made of 2.5mm engineered felt. OUTSOLE: Vulcanised rubber, impermeable and handmade shell, herringbone.Free Next Day Delivery and Free Returns on all orders!