I'm selling this item because it doesn't fit, even though I bought it new. Blue, size M. Only tried on, never used. No price reduction. The secret to a beautiful, straight posture. This Active Balance half-top supports the creation of good posture. The cross panel on the back is designed to make you feel a slight discomfort in your back when your posture is poor. By encouraging awareness of your back muscles, it supports the creation of good posture.