This is a lumbar support belt from Ohshin for lower back pain during sleep. The inner cushion is removable, and it comes in two sizes so you can adjust it to fit your body type. Also, the fabric that touches your lower back can be used on both sides: a soft, warm fabric and a mesh fabric. You can use the soft side in the cold season and the mesh side in the hot summer season, according to your preference. The Velcro closure makes it easy to adjust the size.