Speedo&reg; Men&rsquo;s Breaker Swim Tee-Navy, Large 100% polyester Short Sleeve 100% Polyester Material with Contrast Stitching UVA/UVB Ray Protection Block The Burn Protective Fabric that offers Tighter knit fabric for higher level of protection from the sun's harmful rays Improved fit so over-stretched product does not decrease the UPF rating Dries Quickly