The Rocket boot features Wolverine's EPX technology that brings comfort closer to the foot and helps fight fatigue. Waterproof Plus breathable membrane combined with 600 grams of Thinsulate Ultra insulation ensures feet stay dry and warm. The Rocket HI Insulated Boots also feature: Premium waterproof leather and 900 Denier manmade upper, breathable waterproof membrane with moisture wicking mesh lining, removable dual-density PU EPX Anti-Fatigue footbed, high-rebound compression molded EVA with deer detering color block design midsole, slip resistance rubber pads outsole, cement construction, nylon shank and 600g Thinsulate Ultra insulation. Material: Leather, Rubber.