Breathable and comfortable,This summer sleeve is made of high ice silk fabric (90% polyester and 10% spandex), which is breathable, quick drying and wicking, making your skin feel fresh and cool all day long instead of and sticky.[One activities are ideal, absolutely the choice for your outdoor activities Size Fits All] The natural length of the cuffs for men and women is 15 inches and can stretch up to 40 inches. The upper arm circumference is 8 50 arm sleeves,The sun arm sleeves use the latest UPF 50+ technology, which can block more than 98% of harmful and rays, protecting your arms from sunburn and tanning. Arm sleeves not make you feel cool in the summer, cold winter also gives you warmth! range of application,Riding, running, , driving, fishing, jogging, working outside, soccer, basketball, tennis and all other sports outdoor UPF 3 x sleeve Wide - 20 inches. They are durable and flexible, suitable for youth of all shapes and sizes and adults of all ages 3 X Sleeve UPF Wide - 20 Inches. They Are Durable And Flexible, Suitable For Youth Of All Shapes And Sizes And Adults Of All Ages Range Of Application,Riding, Running, , Driving, Fishing, Jogging, Working Outside, Soccer, Basketball, Tennis And All Other Sports Outdoor