The Plus Size Wedge differs from the original Wedge in the dimensions. The original measures 24 x 14 x 7 whereas the plus measures 30 x 14 x 7. I was on it and I was glad for the extra space. I could feel firmly planted in the center of the Wedge and didn't feel like I was falling off either side. If it was six inches smaller I would probably feel sort of insecure on it, like I might roll off. Insecurity is a total buzz kill for fat sex!