Swimming arm floating ring, High quality durable PVC, non-toxic, eco-friendly. Air float design, comfortable and easy to fit the natural shape of the arm, it is very light weight, will not be a burden on your movement. it is recommended that the arm band is inflated about 70%, which will be more comfortable. Double gas floating design makes the arm band more safe and comfortable. Fully adapted to the natural shape of your arm, you can easily fill it with air by pumping with a pump or blowing with your mouth, and then roll the product over your arm for use. It's super buoyant and can help you stay afloat easily, making it safer and helping you perform better in training or competition. If you want to store it, the gas can simply be discharged and folded to make it as thin as a book, easy to carry and not take up too much space.