nylonImportElastic sealHand washing1. The sleeve is made of cool nylon material, which has more sunscreen and cooling effect. Our sleeve can be cool in summer, and can also make your arm warmer in cold weather. Keep your skin fresh all day.2. Ergonomic seamless design - fine texture and clean details provide 360 elastic fit from upper arm to palm. Arm sleeves provide soothing support, accelerate moisture absorption and sweat elimination, and help you keep the fabric fresh, soft and breathable during cool training.3. Arm sleeves provide perfect mild compression/tension, relieve nerve pain, reduce muscle soreness, and support muscles in weight training and other activities. It promotes healthy blood flow, accelerates muscle recovery and reduces fatigue, making these sleeves very suitable for sports, gym exercises or any activities that require physical strength.4. Suitable for running, playing golf, cycling, fishing, hiking, basketball, football, gardening and other activities.