A NEW LEVEL OF TRACTION TECHNOLOGY. The new Vibram Arctic Grip All Terrain outsole with Vibram XS Trek Evo New Traction Lug Technology provides advanced traction on all terrains including wet ice, snow, mixed/loose surfaces, and hard pack; superior grip no matter the season. The Apex Pro is built for high endurance cool and cold weather pursuits or treks that require a more athletic and agile boot. 100% waterproof with strategically placed rubber overlays that provide additional protection along the shin and forefoot without adding unnecessary weight. 100% Waterproof Fully lined with 4mm CR Flex-Foam neoprene, 100% waterproof with exceptional comfort, flexibility, shock absorption, and heat retention properties; adjusts to the contours of your foot to resist blisters and chafing Breathable mesh lining facilitates air circulation to improve comfort and reduce heat and moisture Dual-density comfort footbed with memory foam for long-lasting cushioning EVA midsole for lightweight comfort and shock absorption Extended rubber coverage for added protection bioDEWIX™ antimicrobial footbed Insert top cover with NZYM™ for odor control and moisture management Combining Vibram®’s All-New Arctic Grip All Terrain outsole with XS Trek Evo compound and their New Traction Lug Technology foradded durability and grip on wet and dry surfaces; providing improved tractionon loose terrain. Pull-tab for easy on and off Estimated height:12 inches Estimated max calf circumference:17 inches Comfort Range: -20°F to 50°F Muck Boot Company Men's Apex Pro & Vibram Arctic Grip A.T. Traction Lug Boot - Black