One Size Fits All - With 4-way stretchy feature, the length can be stretched to 35 inches and the upper arm can be stretched to 7 inches, flexible to any size. Super easy to slip on and off. High elasticity keeps sleeves from slipping down all the time and hugs your arms firmly without being too tight.All-Round Sun Protection - UPF 50+ protective technology works great to keep the harmful sun rays off your skin when golfing, shooting, running, bike riding, etc. No need for greasy sunscreen or long sleeves shirts. These uv sun protection arm sleeves shield your arms from sunburn and skin damage during long days in sun.Full Tattoo Coverage - Black color does work to full tattoo coverage. There is no any visible logo or brand outside this cooling arm sleeves. Wash machine/hand wash & hang to dry to keep sleeves in new-like condition. Comes with 2 pairs for any outdoor activities or work on construction and gardening.Breathable and Comfortable Fabric - Premium breathable fabric with seamless sewing technique snugs lightly on your arms like a second set of skin, soft and lightweight. V-shaped knitting technology on lower arms provides light compression and greatly increases the circulation to release pressure during exercise.Superb Cooling Effection - We made our arm sleeves of sweat-wicking materials, absorbing sweat and wicking moisture away. With a slight breeze or even just moving around a lot they do become cooler than bare skin, supper cooling and comfortable to enjoy a round of golf or basketball.