Cooling & UV Protection: Our UPF 50+ Arm Sleeves can block up to 98 percent of rays, which is a fantastic accessory to add to your sports gear wardrobe because they can help make your sports activities more enjoyable and free. Professional Accessory & Better Performance: These arm sleeves make you look professional! Not only do they look professional, but they also can improve your performance by helping maintain a lower body temperature in warm conditions. By keeping cool, you will be able to perform better in outdoor activities. Suitable for all Sports: Specially designed for outdoor activities, our lightweight arm sleeves keep you comfortable whether you're playing basketball, golf, angling, cycling, climbing, hiking, etc. Soft and Comfortable Fabric: Ensuring its performance in blocking up to 98 percent of rays, we also make our arm sleeves lightweight, breathable and sweat-wicking. These sleeves not only protect you from the sun, additionally, but they also help keep you cool in the noonday sun. Stretch to Fit and Washable: Made of 90% nylon+10% spandex, our sleeves are incredibly durable and stretchy. Machine wash and hang dry. Work for most people. Please feel free to contact us if you have any question.