Design: Seam-sealed waterproof genuine suede upper Waterproof and flexible synthetic rubber shell Generous fit Waterproof gusset tongue comfortably protects the foot from debris HEAT-MX(TM) 145 sustainable thermal insulation keeps your feet warm in wintery conditions Padded collar adds comfort Side zipper closure In-Shoe Comfort: 8mm Zylex(R) felt footbed for added protection and warmth Durability & Traction: SNOWTREAD outsole with deep, self-cleaning treads for stability in snowy conditions Additional Details: Comfortable down to -40degF Height: 8.5 in Weight: 3.1 lbs per pair Circumference: 11 3/4 in (size 9) Leather is from a tannery rated Gold for its water, energy, and waste management practices