The dorsal positioner allows baby to lie comfortably on the back while preventing the risk of plagiocephaly (flat head) linked to the dorsal position. It consists of an inclined plane made of viscoelastic memory foam and two side rollers adjustable using velcros. The viscoelastic memory foam has the property of being molded perfectly around the head of the infant who does not undergo any pressure. The back positioner is made of ventilated materials which ensure perfect ventilation and guarantee total comfort. Cover on top: 100% Polyester; Bottom 60% cotton / 40% polyester; Rolls: 100% polyester; Machine washable cover at 40 ° C.