Chill-Its 6690 Cooling Arm Sleeves provide full arm coverage to absorb and wick away sweat, deliver advanced cooling relief, shield skin from the sun's UV rays, and even protect against light abrasions. Made with soft, lightweight performance knit fabric with UPF 50+ protection from harmful UV rays, these sun protective sleeves provide instant cooling relief when wet and wick moisture away when dry. An anti-odor treatment keeps funky and unpleasant body odors under control when you're going all out. Activation is easy. Simply run the cooling arm sleeves under cool water, then twirl or shake the sleeves to accelerate the chemical-free evaporative cooling process. Wear wet for cooling, or dry for moisture-wicking comfort. Thanks to its high-quality, high-elastic fabric, these unisex protective arm sleeves are suitable for most arm sizes.