Seavenger Super Beanie: 3mm Neoprene Swim Caps Neoprene (3mm) wetsuit cap to protect your head and ears while surfing or swimming Features adjustable Velcro chin strap Provides divers with basic warnth retention and prevents hair entanglement with mask strap. Protects the head from getting sun burnt during surface watersport activities. Comfortable 3mm Super-stretch neoprene hood with taped borader.