【Sunscreen UV protection】:UPF 50+,efficiently protect the skin. 【4 needle 6 sewing 】 Flat and smooth stitching process reduce the friction of the skin. 【Non-slip upgrade rubber tape】 built-in non-slip tape will keep the Sleeve in the right position when doing sports. 【Ice silk fabric 】 Cool touchment and can absorb sweat quickly,keep you cool and dry during summer sports. 【Highly elasticity】 heavy elastic function can fit you well and won't put any pressures on your arms , offering you a comfortable feels. This sleeves are perfect for outdoors and indoors activity, such as running ,fishing,playing basketball,cycling ,ect. keep you cool in hot summer.