Many water balls are constructed from polyvinyl chloride (PVC) 0.8–1.0 mm thick. Thermoplastic polyurethanes (TPU) are the best choice for use in cold weather or on snow. Some water balls are made from a PVC–TPU mix. More expensive balls use 100% TPU. Balls are typically made in China, and come in various sizes. A typical walking 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.