A polyfoam cushion is formed as a triangular right prism 12 inches on a side and 5 inches in height. A thin cover encloses the prism, and defines a zippered pocket in which string fasteners are provided for securing the assembly to a chair. Safety straps encircle the child, and these straps are also...http://www.google.es/patents/US6905169?utm_source=gb-gplus-sharePatente US6905169 - Triangular child's booster seat
