Three- Dimensional (3D) Seamless Weaving Design to make more comfortable than others. Unlike other sun sleeves that make you itchy and leave imprints all over your arms, these sun sleeves are seamless. We make sure you'll be comfortable and happy. Ergonomic Design: Arm sleeves are designed to protect muscles and fit your arms snugly. They reduce the vibration of your muscle and help reduce the fatigue of your arms when you are doing intense sports or working for a long time. Better Wearing Experience Protection - In summer, definitely feel cool, in winter, it can make your arm warmer too, yes , it is so amazing. 99.8% UV Protection, got no sunburn or bug bites. Not easy to cause bacteria, make your skin fresh all day. UV-R, UV-A, UV-B BLOCK 99.8% High Performance Fabric -Fast Sweat Kick-away Fast Dry . Keep you warm in cold temperatures, keep you cool in hotter temperatures Promotes faster muscle recovery blood circulation; offers great forearm protection minimizes injury. For All Outdoor Sports Activities - Such as golfing, cycling, fishing, driving, jogging, climbing, boating, gardening, basketball, tennis and so on. Great skin protection when you working outside or doing any outdoor activities. Cooling protofilament: 90% Acrylic, 10% spandex. Two main functions: Sunblock and Protection Suggested Size: Bicep size is 8 inches - 13 inches, Larger biceps are not recommended UV Arm Sleeves (Sun Sleeves, Cooling Sleeves) Specification: - Texture: Soft, Comfortable, not hot - Perfect for All Outdoors: Great skin protection when your are golfing, driving, cycling, fishing, jogging, gardening, football, basketball, tennis and so on. - Washing Instructions: 1. Dissolve neutral detergent in 30? water 2. Soak for 15 minutes in the detergent 3. Wash by hand gently, do not wring vigorously 4. Avoid washing with mixed colors clothing, line dry in the shade