Apple Music App App Store Mens Contrast Performance Fit Long Sleeve Rash Vest. Billabong performance fit rash vests are designed to protect you from the elements while in your element. Made from recycled silk touch 10oz polyamide fabrication featuring 50 + up ultraviolet protection factor blocking 98% of harmful uv rays ensuring the highest rate of sun protection available. The contrast performance fit is a thicker gauge for rock solid performance fit, this uv surf product is built with the billabong team in mind. All billabong rash guards and surf tees are saltwater and chlorine friendly.