UPF 50 Arm Sleeves:With the newest UPF 50 protective technology,our sun protection arm sleeves can block out over 99.8% of harmful rays to offer your arms all-around sun protection.No blisters and peeling skin,making this summer more easiness and fun!One Size Fits Most:With great elasticity and stretchability, our sun sleeves can fit the arm sizes for most women and men. They simply cover your arms like a second skin without much pressure and won't slide down a bit.No need spending time on picking up the sizes!Cooling and Comfortable Arm Sleeves:Made cooling material (92% nylon and 8% spandex), these cooling arm sleeves are a game changer to offer superior breathable and comfortable wearing in the hot summer. By absorbing sweat and wicking moisture away, you can feel the difference when your arms stay fresh all day instead of being hot and sticky.Suitable for Sports and Daily Use:These cooling arm sleeves are the real deal for outdoor activities such as running, golfing, cycling, driving, fishing and balls sports. Besides, its also perfect for daily use such as driving,working,gardening where you'll be outside in the sun for extended periods.Tattoo Cover up Arm Sleeves:Need to avoid exposing new tattoos to strong sunlight? Tattoos need to be covered during working time, but the hot season makes wearing long shirts unbearable? Our tattoo cover up sleeves can perfectly solve these problems as the tight weave allows the tattoo to be well covered. PS: ONLY BLACK sleeves can cover the tattoo, WHITE NOT.