Sun Sleeves Keep You Cool and Protected Best protective sleeve fit or your money back. To select S/XS, L/M or 2XL/XL, refer to the size chart. Customize and refine your fit even further with the bicep hook and loop size adjustment tabs. When you need to be hands-free, the sun sleeve’s hand protection with thumb hole design can be turned under for arm protection only. Head outdoors without worry knowing Aqua Design’s Sun Blocking Sleeves have the strongest sun protection possible with a lab-certified, UPF (ultraviolet protection factor) of 50+. Camo that is as cool-looking as it is functional, these sun sleeves come in our unique and proprietary water ripple design in colorful Aqua Sky, Misty Sky, and Royal Ripple.