If your youngster is like mine, they do not care for tummy time. This cool gadget changed all of that. The babies love this thing. Even more so, the autistics love it too. (If youd like to know the truth I am kind of partial to it also.) Tough vinyl encompasses the water. There were no loaks. Simply blow up the air channel that goes around the unit and then add water to the middle section. Fun for hours. What a fabulous buy.