On your marks get set crawl! The Sportime Collapsing-Spring Crawl Mega Tunnel provides a colorful and cave-like experience that kids won t be able to get enough of. At a remarkable 12 feet long and ultra roomy 36 inch diameter this tube can even be locked to additional play tubes (sold separately) from end to end to form an infinitely expandable and curved pathway. Tunnel is crafted from a ripstop nylon shell and securely covered spring wire hoops between each different color segment. Ideal for ages 3 and up.