UPF50 protection: the arm sleeves are made of high quality soft fabric, 70% nylon and 30% spandex. They block up to 97% of harmful UVA and UVB rays, preventing sunburn and skin ageing. There is no need to reapply sunscreen. You get maximum UVB protection all day long. Cool feeling: the extremely stretchy material cools the arm sleeves more than the bare skin. Keeps you cool on hot summer days. When you wear this sleeve, it will plummet 5 degrees. No need to worry about being exposed to the blazing sun. The Best Arm Sleeve will protect your arms from damage and is perfect for outdoor football and basketball. Comfortable and breathable: the high performance fabric kicks sweat out and dries quickly, ensuring excellent comfort and keeping your skin fresh all day long. Non-slip elastic at the top and bottom confirms that the sleeve will not slip down your arm. The Best arm sleeves fit most people's arms without any pressure or discomfort. Seamless design: the cooling arm sleeve is seamless and elastic. It provides a perfect 360 fit. Our elastic sleeves are sure to stay on your biceps without making you itch and leaving marks on your arms. the V-weave process fits the curve of your arms and helps them to release pressure better. Fit for your activity: Designed for long hours in the sun, our lightweight arm sleeves will keep you comfortable whether you're running, golfing, fishing, playing basketball, cycling, hiking, driving or even gardening. Also suitable for indoor activities and even your workplace. Your arms won't stick to your desk. You can rest assured that you are protected all day long when doing any outdoor activity.