I have a complete set of armor from a size 46 short Transit II jacket plus a set of hip armor. This includes the following armor: 4 knee/elbow (2 for knees, 2 for elbows), one left shoulder, one right shoulder, one back, and two hip. Only the back armor is a sized item; while this back armor is not labeled as such, per Aerostich's sizing chart, it's a size medium. The back armor is labeled as intended for someone who measures, at a slight angle on the front of your body, 42"-46" from your waist to the where your neck meets your shoulder. See pics. New from Aerostich, these would cost $332. $100 plus shipping for the set.