Muck Boot The Original MuckBoots Adult Edgewater Hi Boot 100% CR Flex Foam Rubber sole 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 Self-cleaning outsole wraps the entire perimeter to provide maximum protection and stability on steep terrain Additional achilles reinforcement for added protection Comfort range from subfreezing to 85 F