UPF 50+ PROTECTION: The arm sleeves are made of premium soft fabric, consisting of 70% Nylon and 30% Spandex. They can block up to 97% of harmful UVA and UVB rays, helping to prevent sunburn and skin aging. No need for sunscreen. Enjoy maximum UV protection throughout the day. COOLING FEELING: Made from extremely elastic material, the cooling arm sleeves are cooler than bare skin. You will maintain a refreshing sensation during hot weather. While wearing the sleeves, it will lower your temperature by 5 degrees. Don't worry about being exposed to intense sun. COMFORTABLE & BREATHABLE: The high-performance fabric quickly wicks sweat and dries rapidly, ensuring exceptional comfort and keeping your skin cool all day long. The anti-slip elastic bands at the top and bottom ensure that the sleeves stay in place on your arms. These arm sleeves fit most people's arms without any pressure or discomfort. SEAMLESS DESIGN: The cooling arm sleeves are seamless and elastic. They provide a perfect 360-degree fit. Our stretchy sleeves can securely stay on your bicep without pinching or leaving marks on your arms. The V-knitting process adapts to the arm's curve, helping to relieve pressure better. SUITABLE FOR ALL ACTIVITIES: The arm sleeves are designed for long hours in the sun; our lightweight arm sleeves keep you comfortable whether you're running, golfing, fishing, playing basketball, biking, driving, or even gardening. They're also suitable for indoor activities, even at your workplace. Your arms won't stick to your desk. Enjoy peace of mind and stay protected throughout the day during any outdoor activity.