Purple rocks!
I thought this cushion might work well for sitting as part of my pain is the back of my legs plus the pirformis muscle which takes the most pressure. The size did allow me to sit just on my rear and to not catch the back of my legs. It was OK for this but the portable model works better for so I use it for what it was designed for -- the small of my back. Comes with a belt that allows easy positioning while sitting. Too bad I can't freeze it for cold therapy.
Rating: 5 stars