Not all backsides are the same, find your BackJoy fit
BackJoy posture seats are designed to cradle the space around the two sitting bones at the base of your pelvis and must be smaller than your buttocks to do so. The best guide for fit is to align your hip or pant size as follows:
MD-XL: For Medium and up try our Core models for the maximum posture support.
BackJoy seating products are most effective for adults between 90 and 300lbs. If you prefer a roomier fit, try the Core Lux, Posture Core, Core Traction, or SitzRight. If you weigh less than 120lbs, try the Angel.