1、Comfortable Fabric: This arm sleeve is made of premium polyester woven fabric, which is highly breathable and comfortable to wear. 2、Elastic Mouth: The elastic mouth is not tight and has good shrinkage to prevent the protective gear from falling off during exercise. 3、Anti Collision: Built in scaly anti collision blocks, effectively slow down and disperse the impact, and maintain the flexibility of movement. 4、Elbow Protection: The anti collision block disperses the impact force brought by the movement, and fits to preserve the arm, especially the elbow joint. 5、Applicable Scene: This arm sleeve is suitable for a variety of sports scenes, outdoor basketball, football, mountaineering, cycling, etc. Item Type: Anti Collision Sports Arm Guard Sleeves Material: Polyester Gross Weight: 85g / 3.0oz Color: White Specifications: two pieces Size: M: Armguard Length: 40cm/15.7in, Top Perimeter: 25-33cm/9.8-13.0in, Bottom Perimeter: 13-21cm/5.1-8.3in, Suitable Weight: within 60kg/132.3lb L: Armguard Length: 41cm/16.1in, Top Perimeter: 27-35cm/10.6-13.8in, Bottom Perimeter: 15-23cm/5.9-9.1in, Suitable Weight: within 70kg/154.3lb XL: Armguard Length: 42cm/16.5in, Top Perimeter: 29-37cm/11.4-14.6in, Bottom Perimeter: 17-25cm/6.7-9.8in, Suitable Weight: over 70kg/154.3lb 2 x Arm Guard Sleeve