Silicone Wrist and Ankle Weights silicone outer material, refined galvanized steel bar, invisible and durable, waterproof and sweatproof, not easy to fall off, adjustable elasticity, exercise more comfortable. Add steady and comfortable resistance to your workout, effectively increase your heart rate ‘burn fat and build muscle’. Reach your fitness goals faster. Suitable for running, boxing, yoga, hiking.  COMFORTABLE TO WEAR: The armband is made of eco-friendly silicone, and the two-pound strap can be easily worn on the ankle or armband for a comfortable fit.  ADJUSTABLE SIZE: Adjustable elastic straps and ultra-strong buckles make these arm weights fit any size and move your loaded wristbands with ease.  WATERPROOF AND SWEAT RESISTANT: Waterproof, sweat resistant and sweat stain resistant, they are not easy to slip off when exercising and can also be used in the swimming pool.  DAILY TRAINING: Compact and portable, perfect for home, gym and other workouts, making every movement more challenging for both men and women. Colour: Black Material: Silicone, steel Product Size: 30cm/11.8 inches Package content: 2PCS/1pairs