Waterproof Premium Pull Up Leather Upper Seam Sealed Waterproof Construction Removable 9mm Zylextra®, Liner Moisture Wicking Lining Genuine Shearling Snow Collar Waterproof Pull Up Leather Gusset Tongue Traditional D-Ring Lacing System Thermal Barrier Insole for Extra Warmth Waterproof & Lightweight Synthetic Rubber He Shell Kamik&rsquo, s SNOWBOB Synthetic Rubber He Winter Outsole Height 11 Inch (27.9cm) / Weight 4, 26 lbs (1932g) (per pair) Rubber He Lightweight Superior traction in all temperatures Recyclable, PVC-free Strong like iron, yet light like helium, Rubber He is Kamik&rsquo, s own lightweight innovation. This recyclable, PVC-free synthetic rubber is 50% lighter than natural rubber & 30% lighter than other synthetic rubbers. & it&rsquo, s flexible, extremely durable & protective, offering two times more abrasion-resistance than PVC rubber. Seam Sealed This technology makes boots practically impenetrable to snow & moisture without adding any extra weight to the footwear. By specially treating our leathers & nylons, then using waterproof tapes & sealants to cover every seam, it&rsquo, s like feet are wrapped in a cocoon. So they stay safe & dry. Zylextra®, Comfort rated to -58°, F/-50°, C Easy removal for washing &, drying Our proprietary Zylextra technology has four distinct layers to help keep feet warm & dry. The first layer wicks sweat away from the foot, while the next two are made up of dense felt & foam to trap body heat. The outer layer is made from a space age thermal foil that deflects cold air & reflects body heat back to the foot, providing even more warmth & moisture control. & with reinforced seams & heel guard, they&rsquo, re incredibly durable.