The Infinity Travel Hoop is a full sized adult hoop that folds down to a quarter of its area approximately 20 to 23 inches. No need to break your nails pushing buttons with this hoop, it's a collapsible travel hoop that does not require connecting individual lengths, retaping, or the use of bunge cord. The hoop will not separate or come apart during use. There is no assembly required. These hoops are made from durable and slightly weighted tubing weighing approx 1.5 to 2.0 lbs, and connected with unique patented swiveling connectors. Available in two sizes small adult 38" and regular adult 42" diameter with a variety of color styles utilizing cool glitter tapes with colorful gaffer tapes. Diameter of the hoop is measured from the floor to the top of the hoop when in a full circle. To open your Infinity Travel Hoop, locate the 2 swivel connector points and unfold the hoop so that the connectors are at the center of the infinity shape. Now place your hands on those 2 connecting points and stretch the hoop open to its full size. You will need to slightly bend the hoop at these points to restore the circular shape. As you become more familiar with how your hoop folds, you will discover other interesting ways to open and close your hoop. Thanks and Happy Hooping!