Barefoot International Barefoot Heater ShirtThis Barefoot International Barefoot Heater Shirt features a 0.5 mm neoprene rubber material build. Designed to be worn underneath your wetsuit, this flexible barefoot heater shirt will offer extreme comfort and will keep you warm when it's cool. 0.5 mm; Neoprene Rubber Material Build; Flexible; Designed To Be Worn Under Your Wetsuit; Offers Extreme Comfort; Designed To Keep You Warm When It's Cool;