In order to ensure the durability of iron sandbags, thick seam design is specially adopted to expand the scope of use. Selected high-quality mercerized fabrics, close fitting, elastic and loose; After training the intensified operation of ankle or wrist, stretch body muscles and burn some fat, which is helpful to shape body parts. For example, stretching exercises and calorie burning in local areas such as legs, ankles, wrists, arms and thighs. It helps improve metabolism and aerobic exercise; This product adopts delicate Lycra edge and delicate skin friendly soft fabric, which has the least friction damage to the skin. The special hard ring buckle can effectively fix the sandbag. The body is small and can be put directly into the bag or worn directly on the wrist. It is undoubtedly the best choice for mountaineering and running.