Fabric:Sunscreen arm sleeve fabric is engineered for cutting-edge performance and comfort, including our exclusive technology that accelerates moisture wicking for a cooler workout and helps keep the fabric fresh Soft, lightweight, breathable, moisture wicking and quick dry to keep you active all day. Seamless & DurableThe compression arm sleeves with a delicate fabric material and fine sewing skills.The fabric is reinforced and won't unravel or tear easily even washed for long times.(with laundry bag for machine wahing,hand wash is more recommended) Sun UV ProtectionSun protection arm sleeves with the newest UPF 50+ protective technology for effective UV protection,whick can block out over 98% of harmful UVA & UVB rays to offer your arms an all-around UV protection. Say goodbye to sunburn & sunscreen Superior Cooling: The sunscreen arm sleeve is ice silk fabric, which helps to cool your skin for 3 hours after absorbing sweat or water. It is the exact provides you with the cooling and comfortable feeling throughout the whole hot days. Tattoo Cover Up: 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. The sweat-wicking fabric allows the new tattoo to breathe under the cover, keeping it cool and dry, and the tight weave allows the tattoo to be well covered. (Only Black Sleeves Can Cover The Tattoo, White Not)