The Fun Run? is the perfect enclosure to keep your pets safe outdoors. The Fun Run is designed to provide indoor pets with a safe environment to run and play outside. The tunnel is made of a strong nylon mesh shell and a sprung-steel frame that pops open instantly -- no assembly required. Includes sand pockets and pegs to secure to ground and a carry tote. Zip two together for double the fun and safety!! Can also be used for other small pets such as rabbits, guinea pigs, ferrets and chinchillas!