CAGAC Kagakku Posture Correction Cushion for Learning Navy L Size Stored at home after being used a few times. There is no particular feeling of use, but I would like those who understand that it is not new to purchase it. The following is a product description: Correct your posture with Kagakku at school or at home! When sitting, the pelvis tilts backward, and the spine bends in conjunction with it. To sit correctly, it is necessary to bring the state of the pelvis closer to when standing. When sitting in a chair for studying or reading, preventing the backward tilt of the pelvis naturally leads to a beautiful posture with a straight back!