The classic Muck Boot neoprene adjusts to the unique contours of your foot, making these reliable boots flexible, 100% waterproof and lightweight. These tough boots feature a rubber overlay and quick cleaning sole, allowing you more time to get on with the important stuff. The upper is reinforced in both the toe and heel area, plus additional arch support giving you the protection you need. The 5mm neoprene makes these boots lightweight and flexible, with breathable air mesh lining to keep you cool on warmer days.  These boots are 100% waterproof, featuring easy to clean rubber overlays, reinforced arch support, a triple rubber toe reinforcement, quadruple rubber heel reinforcement, and a breathable mesh lining to wick away humidity and perspiration, allowing air to travel throughout the boot.  The 5mm CR Flex-Foam neoprene liner is 100% waterproof with exceptional comfort, flexibility, shock absorption and heat retention properties; adjusts to the contours of your foot to resist blisters and chafing, and the bioDEWIX™ antimicrobial footbed insert topcover with NZYM™ provides odor control and moisture management.