The 6-layer Fish has a size that enables the child to sit on it while in movement, which enhance not only the balance but also the joint senses. Children can lie across them and have the backside of their bodies strengthenend, and children can exercise their arms through the pressure from their own body weight. Designed by Bolette Blaedel and Louise Blaedel in Denmark. Made of EVA foam with soft surface. Wipes clean with a wet cloth. Makes no noise, do not make any damages to the floor, furniture etc. Free of any toxins and phthalates. Max weight 350 Lb.