The Gordini Men's Stomp IV mittens are made of woven nylon with 3-layer thermal ply waterproof, windproof, and breathable fabric trim and have Duragrip palms, digital grip finger area, and a zippered heaterpack pocket. Insulated with Megaloft and made waterproof with Aquabloc, Stomp IV mittens keep your hands warm and dry in the toughest conditions.