UPF 50+ PROTECTION: The arm sleeve is made of premium soft fabrics, 70% Nylon and 30% Spandex. It can block up to 97% of harmful UVA and UVB rays to prevent sunburn and skin aging. No need for sunscreen anymore. You get maximum UV protection all day long. COLD FEELING: Extremely elastic material, the cooling arm sleeves are cooler than bare skin. You keep the cool feeling in the hot summer. When you wear the sleeve, it will be straight down 5 degrees. Don't worry about being exposed to the blazing sun. COMFORTABLE & BREATHABLE: High-performance fabric can wick sweat quickly and dry quickly, ensuring exceptional comfort and keeping your skin feeling fresh all day. The non-slip elastic bands on the top and bottom to confirm that the sleeves won't slip off your arms. The arm sleeves fit most people's arms without any pressure or discomfort. SEAMLESS DESIGN: Cooling arm sleeves are seamless and elastic. They can offer a perfect 360 fit. Our stretchy sleeves can surely stay on your biceps, without itching and leaving imprints on your arms. The V-knitting process adapts to the curve of the arm, helping the arm to release pressure better. Suitable for All Activities: Arm sleeves are designed for long hot hours in the sun, our lightweight arm sleeves will keep you comfortable whether you are running, golfing, fishing, playing basketball, biking, driving or even gardening. They are also suitable for indoor activities, even in your workplace. Your arms won't stick to your desk. You can be assured of protection throughout the day during any outdoor activity.