This play mat is constructed from Heave Duty PVC that has been thoroughly tested and will Not Leak air or water. Watch as your infant enters our fish tank Wonder World, wide eyed and Fascinated by the bright colors, sharp contrasts and cute floating toys. Rain or shine is tummy time. Simply fill the outer ring with air and the inner mat with your desired level of tap water, set it on the floor and let the fun begin! It folds easily when empty into your purse or toy bag to bring along anywhere you go.