Thank you for viewing. This is a supporter for protecting and preventing lower back pain. It is size M. I think it was probably stored without being used, but I may have tried it on. I don't feel any signs of use, but it was stored in a dresser and has creases. There is plastic in the back part to act as a core. Also, there is a pocket-like part on the inside of the back. It's made of mesh material, and it looks like you could put a warmer in it for winter. I can't find the bag or instructions that came with it when it was sold, so I don't know the top and bottom, but I don't need it now, so I hope someone who needs it will use it. It is size M, but if you would like to confirm the length, please contact me. I am considering sending it via Yu-packet Post. Breathable mesh material and adjustable support belt. - Color: White - Material: Mesh fabric - Design: Adjustable support with hook and loop closure - Type: Support belt