●The material of the arm sleeves is made of high-quality ice silk (viscose fibre), the fabric is moisture-wicking and absorbs sweat quickly, increases high wearing comfort. ●With UPF 50+ sun protection, block 98% of UVA/UVB rays to protect your arms from harmful sun rays. ●It is suitable for cycling, hiking, basketball and other outdoor activities. ●Please refer to the size details in the picture before purchasing. The colours may vary slightly on the website due to computer image resolution and monitor settings. ●We have promised to provide our customers with the best service. If there is a problem, just contact us, we will help you solve the problem.