New Style by Brand "Sun Protection Swimsuits" Fabric composition: 80% Nylon/20% Spandex. Boys Full Body Swimsuit Sunsuit Sun Protection UPF50+ Navy Blue sizes 4 to 16. Excellent stretch full body swimsuit, very comfortable and soft on the skin, Provide UV and jellyfish protection; suitable for outdoor and indoor water sports activities, including swimming, water jumping, underwater swimming, light diving and all type of water fun activities. The design and style guarantee comfort, free body movements, and enhance performance, featuring flat-lock stitching and UPF50+ cover blocking over 97.5% of the sun UV radiation. Tip for easily slipping the suit on and off: make sure your skin and the suit are both dry. Very Important! Sun protection swimwear, sun hats and uv protective clothing ratings are measured in UPF not SPF.