Size guide 5054 cm (19.6921.26 in) 5457 cm (21.2622.44 in) Size M 5759 cm (22.4423.23 in) Size L 5962 cm (23.2324.41 in) Size XL 6265 cm (24.4125.59 in) Size XXL Key benefits UPF50 protection for the head and neck against harmful UV rays, helping prevent sun exposure during outdoor water activities Protects the head from scratches and other hazards in and around the water elasticity with recovery for a secure, comfortable fit Glued and blind stitched construction provides strength and durability, reducing cold water inflow and helping you stay warm and comfortable Construction and performance Designed for reliable performance in demanding water environments Seams are glued and blind stitched to minimize leaks and maximize durability Flexible fabric with stretch supports a snug fit across a range of head sizes Applications Suitable for scuba diving, snorkeling, spearfishing, diving, surfing, winter swimming, underwater engineering and other water sports Use scenarios Scuba diving or snorkeling in coastal or reef environments where UV exposure and splash are common Winter swimming or cold water surfing where insulation and water sealing improve comfort Underwater engineering or maintenance tasks that require prolonged exposure to water and sun protection