Waterproof membrane seals out water and lets moisture escape,Waterproof suede leather and waterproof nylon ripstop upper,Protective and abrasion resistant coated leather heel and toe cap,Solarcore insulation utilizes the thermal advantages of Aerogel— the same material NASA uses to insulate spacecraft — to deliver best-in-class thermal performance in a flexible, breathable low profile form that delivers ultimate performance for cold weather activities.,Vibram Icetrek outsole designed to provide the improved grip on very cold, icy, or snowy surfaces