Design: Seam-sealed waterproof genuine suede and nylon upper Waterproof and lightweight synthetic rubber shell HEAT-MX(TM) 145 sustainable thermal insulation keeps your feet warm in wintery conditions Speed lacing system for a quick, secure fit Odor-eliminating, natural and non-toxic Cleansport NXT(TM) treatment In-Shoe Comfort: Removable CushyStep Everyday EVA foam footbed adds comfort and support Moisture wicking brushed nylon lining for comfortable all-day wear Durability & Traction: DEFENDER2 outsole offers heightened stability and traction in snowy conditions Channels easily disperse snow, mud and water Additional Details: Comfortable down to -40degF Height: 9.84 in Weight: 3.41 lbs per pair Circumference: 11 in (size 9) Leather is from a tannery rated gold for its water, energy, and waste management practices