The Original MuckBoots Unisex Tack Mid Boot Rubber and fabric Stretch-fit topline binding snugs calf to keep warmth in and cold out 5mm CR flex-foam bootie with four-way stretch nylon, 100% waterproof, lightweight and flexible Diamond tread self-cleaning outsole wraps the entire perimeter to provide maximum protection and stability Additional achilles reinforcement for added protection and added toe protection with a wrap-up toe bumper Seamless, quick-clean rubber overlay