Thank you for viewing. This is a Shape Boost posture support belt, size M. I used it a few times, but I'm selling it now because I don't use it anymore. It has been washed. [Featured on terrestrial TV! Uses an underarm pain prevention belt] Posture support belt, posture corrector, rounded shoulders, back muscles, back, unisex, breathable, easy to put on and take off, adjustable size (M size) It will be shipped via Yu-Yu Mercari Mail Yu-Packet. Please check the photos and consider purchasing.