... material which confirms to international standard, innoxiously, environment-friendly and long lifespan. Compared with TPU, PVC plays not so excellently in material ... functions, but cheaper.2), generally, how long can people stay in the water ball?a). 15-20 ... !6), NIGHTIME WATER FUN INSIDE THE "LOVEBALL"We use a long safety rope, at night, thus allowing for floating in privacy ...