Comfortable down to -22°F,Waterproof genuine leather upper with DriDefense membrane. ISA TanTec’s LITE eco-friendly leather. Leather is from a tannery rated gold for its water, energy,,145g of HEAT-MX sustainable thermal insulation,Vibram Arctic Grip All Terrain outsole. Arctic Grip provides excellent grip and traction on wet ice surfaces. XS Trek Evo rubber compound adds durability along with grip on wet and dry surfaces. and waste management practices,ASTM F2913-19 Certified