The Performance Ankle/Wrist Weights are designed to challenge your bodyweight movements. They provide additional resistance for your exercises without putting stress on the joints as is the case with traditional strength training. The Performance Weights are ideal for building strength, cardio and muscular endurance and provide the extra level of difficulty you need to improve your fitness. The dumbbells are designed to wrap comfortably around your ankles or wrists for a less bulky and tighter fit, so you can continue your workout with more energy and less weight shifting. The suede lining ensures total comfort. The weights are close to the skin without irritating it. The Velcro fastening and cast-iron buckle provide additional support and a secure fit.