As one of the major manufactures of Physical Educational Sports Products for more than 20 years in Taiwan Everrich is very proud of themselves for their quality products and excellent services which have already won them very good reputation and confidence from their global clients. Ideally suited for large group recreational activities! The multi-colored cover is constructed of heavy duty long wearing water repellent nylon. Double seamed and inverted locked stitched. Bladder is made of super tough material and are resistant to puncture and leakage.