【Anti-Ultraviolet Cooling Arm Cover】: Our black arm sleeves is made of ice silk fabric material, the sun protection index breaks UPF50+, effectively blocking more than 99% of ultraviolet rays, sunburn, and sunburn. During outdoor activities, sports, etc. in summer, cooling sleeves can protect your arms from ultraviolet radiation and help protect your arm skin. 【Sun Protection & Cooling Function】:The sun protection sleeves is made of sunscreen cool fabric, which effectively protects your arms from sunburn, from harmful rays, and cares for your skin; and it can absorb sweat and wick away moisture, keeping your arms fresh throughout the day. Let you enjoy a comfortable summer. 【High Elastic Design】:Our cooling arm sleeve are very durable and flexible. Made of 95% nylon and 5% nylon, these cooling sleeves with good elasticity can be stretched to suit most people, both men and women. Provide superior comfort for men and women through soft and breathable fabrics. 【Avoid Slippage & Delicate Stitching】:It has a special non-slip design and delicate stitching. The non-slip cooling arm cover is attached to your arm and will not let the arm cover slip off annoyingly. With high-quality sewing, these sleeves will not be easily torn off. Ultra-thin and light, no marks will not leave marks on the arm.