Design: Seam-sealed waterproof genuine leather and nylon upper ISA TanTec's LITE(TM) eco-friendly leather Waterproof gusset tongue protects the foot from debris HEAT-MX(TM) 145 sustainable thermal insulation keeps your feet warm Odor-eliminating, natural and non-toxic Cleansport NXT(TM) treatment Heel counter lug for easy removal and snowshoe strap retention In-Shoe Comfort: Moisture wicking fleece lining allows for comfortable all-day wear Removable CushyStep Everyday EVA foam footbed adds comfort and support Durability & Traction: Waterproof and flexible synthetic rubber shell ICEKISS dual-density, self-cleaning tread design for stability in snowy conditions Additional Details: Comfortable down to -40degF Height: 7.87 in Weight: 2.29 lbs per pair Circumference: 10.23 in (size 7) Leather is from a tannery rated gold for its water, energy, and waste management practices