Aqua Sphere's Long Sleeve Stingray Youth Core Warmer Suit is designed to keep any budding swimmer warm and protected during chilly pool sessions. Its full upper body and above knee coverage makes it an ideal accessory to have on hand for snorkeling, playing at the beach, and cool weather swim lessons or anywhere else your child needs a bit of extra coverage and warmth.Made from a unique blend of Neoprene and Lycra, the Youth Long Sleeve Stingray provides excellent insulation while maintaining flexibility and range of motion. The 2mm Neoprene on the torso traps a thin layer of water between the suit and your child's skin. The water is warmed by body heat and remains warm against the skin, keeping your child comfortable in a cold water environment. The flexible Lycra legs and arms of this kid's wetsuit help cover your child's extremities without restricting range of motion.