One Size Fits All Polyolefin Hot Socks offer the ultimate warmth for cold water activities. Wear underneath your neoprene boots for the greatest warmth and protection. Benefits of Polyolefin:Wicking- Polyolefin material wicks moisture away from the skin more effectively than any other fiber, keeping the wearer warm and dry. Superior Insulation- Polyolefin has the highest insulating capacity of any fiber, natural or man-made. Warmth without bulk while being extremely durable. Will not fade when exposed to sunlight Washable and care-free. Does not retain odors.