I have an Invacare TDX Spree with an attached part of chair seat that has Tilt/Recline seat. The seat cushion is air (Valve opens/closes inflates/deflates with an easy twist. There is also gel where coxxus (Tailbone)meets chair. I am in chair 24/7 so seat is very important to my comfort. It was expensive, Health insurance did not cover full price, but to me well worth it. If I had the money I'd have elevating too.