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 Comfortable & Durable Cooling Arm Sleeve is made of durable, weather resistant and stretchy material.Arm Covers are chemical FREE and completely safe for you and your kids.Our sleeves are incredibly durable and stretchy.Easy to machine wash and hang dry. 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) One Size Fits MostThe natural length of men & women arm sleeve is 15 inch and max stretches to 33 inch. the upper arm circumference is 3.7", max stretches to 8 inch.They are durable and stretchy, great fit for all shapes and sizes and teenagers as well as adults of all ages. 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.