ELASTIC MATERIAL - A pair of Sport Arm sleeve is made of lightweight 85% polyester&15% spandex fibre, elastic, wick-moisture and quick-dry. The universal cooling sleeves is fit for 9 inches -15inches unflexed bicep for 198lbs - 352lbs men,women,boys, girls. COOL & SUN PROTECTION - Arm sleeves are very cool in summer while it can make your arm warmer in winter. Our sports sun sleeves can protect your skin from UV 40+ sunburn and bug bites in ourdoors. The sleeves are also the easiest way to cover tattoos. GREAT FOR MANY ACTIVITIES - The compression sleeves can improve blood circulation to relief tired, sore or injured muscles and prevent injuries in sport, such as golfing, cycling sleeves, fishing , driving, jogging, climbing, boating sleeves, gardening, basketball arm sleeves, tennis and so on. ADVANCED PRINT TECHNOLOGY - Arm sleeves are printed using an advanced Sublimation technology to ensure that the colors remain bright and true after wash and wash. We use environmentally friendly dyes, which are harmless to your health. 100% SATISFACTION GUARANTEED - If for any reason you do not like your cooling arm sleeves when you recieve it, contact our friendly customer service and we'll provide a free exchange or refund, no questions asked.