A water ball or water walking ball is a large inflatable sphere that allows a person inside it to walk across the surface of a body of water. 
The large ball is usually two metres in diameter and has a German zippered entrance to allow for easy entry and exit. The water ball is similar to the zorb, but it has only one layer and is designed for water travel rather than downhill rolling. The balls have been used at swimming pools, marinas and lakes in an effort to keep children fit.

Many water balls are constructed from polyvinyl chloride(PVC) and Thermoplastic polyurethanes (TPU) are the best choice for use in cold weather or on snow. Some water balls are made from a PVCTPU mix. More expensive balls use 100% TPU/PVC. Balls are typically made in China, and come in various sizes. A typical water ball stores flat and weighs 15 kilograms, and can be inflated in under a minute with a good air pump. Some models also have hand grips on the inside or outside, and the surface can be printed on.

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