During upper body strength training, the wrist bears more weight load, the power-assisted wristband provides wrapped fixed support, providing stable protections, properly avoids injury caused by strength training. Features: An perfect equipment for physical fitness, losing weight and exercising agile. Practical and fine workmanship, safety and comfortable to wear. Perfect for any one who loves fitness training. The tightness can be adjusted freely according to the exercise intensity. There is a hole for thumb. Specifications: Color: black, blue (optional) Material: nylon+SBR Item size: 390 * 75mm / 15.3 * 3.0in Item weight: 24g / 0.8ounce Package size: 210 * 150 * 10mm / 8.3 * 5.9 * 0.4in Package weight: 30g / 1.1ounce Packing List: 1 * Wrist Band