Speedo Men's UPF 50+ Easy Short Sleeve Rashguard Swim Tee 100% Polyester Imported UV Block the Burn with UPF 50+ protective fabric features More body coverage for greater sun protection 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 Our swim shirts are looser fitting than a rashguard. If you would like a tighter fitting swim shirt, size down