Lifemall UMM 3mm Neoprene Water Sock 3 millimeter neoprene keeps feet warm,prevent chafing and add insulation Anti slip bottom and tightened velcro buckle closure Lifemall wetsuit socks designed to keep a layer of warm water between your skin and colder water. Great for healthy barefoot walking and hard to be come off in the water Tough neoprene protect against cold, old, sharp objects and sand