Enjoy your on-the-water activities in protective style with the Hot Tuna Rash Tee, crafted with a mock neck, ?-length sleeves, and flatlock seams for a comfortable fit and less irritation. As you're outdoors, 50+ UV protection guards against damaging sun rays.. . Mock neck. 3/4-length sleeves. Flatlock seams. 50+ UV protection. Provides UVA and UVB protection from the sun. Body: 82% Nylon, 18% Elastane. Complies with EN 13758-2 standards. Please Note: Sun exposure causes skin damage. With this tee, only covered areas are protected. The protection offered by this item may be reduced with use or if stretched or wet.. Imported. . NOTE: This product is sold in U.S. sizes. While the physical product may display both the U.S. & U.K. sizes on it, please place your order using the U.S. size.