La-VIE Koshi no Mikata (Friend of the Waist) Air-Inflatable Roller This is an air-inflatable cushion-type stretch roller. By lying on your back and placing the roller between your lower back and the floor, you can stretch to correct your pelvis and refresh stiff backs. It uses a soft-to-the-touch velvet material. Air-inflatable. It can be stored compactly when not in use, making it convenient to carry.