Material: The swim belt is made of high quality environmentally friendly elastic silicone, which has delicate touch, softness and strong cushioning performance. No cheap PET materials are used. All are made of high strength plastic (no rusty iron under water) and natural latex. It can be used underground or underwater. . Size: Inside diameter 6 mm / outside diameter 10 mm / length 4 m. This set is a 6-piece set: swimming belt, elastic rope, medium extension ribbon rope, resistance water pocket, fixed end small strap, mesh bag storage bag. . Training: The belt is enveloped in thickened and widened foam to bring you more comfort. The adjustable range of the belt is wide. With it, it can help us practice swimming better and ensure safety. You can fix it on the pool ladder or any other fixed position. . Wide Application: Designed to fit in-ground, above-ground, outdoor and indoor pools. Effective low impact training for adult, child, pro, amateur and so on, for swimmers of all ages and skill levels. .