The Achievement Positioning System is a positioning wedge system designed to provide firm, comfortable positioning for children and adolescents with neurological or severe physical disabilities. This system can be used in a variety of configurations including prone, supine and sidelying positioning. Unit assembles as a cube for easy storage and has Velcro tabs for connecting the pieces. The wedges are made of fire-retardant dense foam and easy to clean vinyl. SIZES: The set includes two small wedges and two large wedges. DIMENSIONS (LxWxH): The large wedges are 32 x 20 x 13 inches and the two small wedges are 14 x 20 x5.5 inches with Velcro tabs.