A quality stitched, friendly frog is set overtop a mat filled with water and fun shapes that move and float around in his belly. The water-filled mat is coated with a soft removable fabric made of polyester which is machine washable. The fabric ensures babies are comfortable lying down. Easy to fill safety relief valve included. Item sold empty, should be filled with distilled water by consumer. The outer shell is made of machine washable polyester and the inner sac is made of BPA-free plastic (phthalate-free PVC).