The Crawl Cube Plus, model W4586, is a large foam shape designed for use with children with physical disabilities. Made of dense poly-foam and covered in vinyl-coated nylon with zipper closure, this cube can be used for crawling and climbing. When the touch fasteners at the corners are released, the cube transforms into a long, straight crawl course of four flat-topped mounds. Two or more units can also be connected for a variety of movement activities. DIMENSIONS (WxHxL): In the cube formation, the unit is 24 x 24 inches with a 16 x 16 inch opening. When in the straignt, crawl course formation, it is 8 feet long.