I own a tempurpedic version of the neck pillow. Prior to owning the therm-a-rest cushions I did on a few occasions use the tempurpedic as a seat cushion. While it provide some immediate relief it doesn't come close to the thermarest in terms of overall comfort and flexibility as a seat cushion. It's obviously far superior as a neck cushion. Also size wise the tempurpedic is actually more volume than the thermarest.