The Muck Boot Company Men's Apex Mid Zip Outdoor Boots are high-performance boots built on an innovative platform for high endurance outdoor pursuits requiring a more athletic and agile boot. These work boots are 100% waterproof and coupled with breathable mesh linings to provide elite protection and moisture management. The upper features a lock-down zipper closure system, a natural scree collar and surprisingly light-weight performance for great all-day comfort and fit. These men's work boots are equally at home on loose rocky terrain, cold/wet ground and of course, the MUCK. Men's work boots are 100% waterproof Breathable mesh linings Dual density insole for all day comfort EVA midsoles for lightweight comfort and shock absorption Outdoor boots feature rugged rubber outsoles for durable traction bioDEWIX antimicrobial foot bed insert top covers with NZYM for odor control and moisture management Pull-tab for easy on and off Our lightest outdoor/hunting boot - Weight 2.65 lbs size 9 Estimated height: 20cm/ 7.9in Estimated max calf circumference: 25cm/ 9.8in Comfort Range: Sub Freezing to 65F / 18C Lock-down zipper closure system, with a waterproof zipper, the industry's finest and most durable technical zipper construction