UPF 50+: UV50+ Block the Burn protection from the sun's harmful UVA and UVB rays. 2.0MM NEOPRENE: Equipped with high density tear-resistant Neoprene (2.0mm neoprene), construction for warmth and buoyancy, extremely lightweight and comfortable. Safeguard for water recreation, get more confidence when swimming, kayaking, canoeing, snorkeling, swimming training,water park,beach holiday or sea surfing,etc. holiday or sea surfing,etc. Large arm holes, allow maximum movement; Easy to store and pretty light for taking abroad. Gives people confidence to learn swim and play in the water.