This Climb-in Balloon is 72 inch (180 cm) with a wide neck of 7 inch (17 cm) which makes it possible to climb in the balloon. The latex is extra thick and strong, therefor it wil not pop easily when your are climbing in the balloon. Guaranteed for a lot of fun. In the user instruction page you can see how to use the climb-in balloon. You can close the neck of the balloon with a 15cm balloon clip.