Expensive, but worth it.
Used in my truck on a 3500 mile, nine day road trip over some torturous highways.  It was a potential lifesaver for someone with DVT.  Cushion is very soft, and does not overheat you. Comes with a breathable (pillow) case that has a handle. Downside is that it is clingy, and tends to go with you as you exit the vehicle.  Could be used as a back support, but might bunch up. Overall, an excellent product for those who need it.
Rating: 5 stars