Muck Boot Men's Apex Pro Vibram Arctic 12in Uninsulated Waterproof Hunting Boots - 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 Vibram Artic Grip A.T. Dual density footbed with memory foam 4mm Neoprene bootie for comfort and performance bioDEWIX dry footbed insert topcover with NZYM for odor control and moisture management Lightweight EVA midsole Pull tab provides easy on/off Breathable air mesh lining facilitates air circulation Estimated max calf circumference: 17in Comfort range: -20degF to 50degF / -30degC to 10degC Style: APMTMDNA