The most important way of treating pressure sores is preventing them. What this says is that those who don't have normal sensation should do this also. When seated, you can relieve pressure by pushing up, shifting side to side, leaning forward, or, if you are unable to do these, you can get a power-recline wheelchair that you can lay back using a switch, and relieve the pressure that way. The first thing I must say is that no cushion or mattress takes away the need for pressure relief. And that also means turning in bed every 2 hours or so at night if a person don't do that automatically anymore.
Wheelchair cushions come in all sizes, descriptions, and prices.
Some general guidelines. Now, these sometimes work against one another, and one needs to choose the characteristics that are most important for one's particular condition. However, this cushion is short on stability. The Jay cushion also provides good pressure distribution and a little more stability. If you have sensation, a moderately dense foam cushion is probably going to provide the best comfort and portability for you and is much more economically priced.