I have purchased the Roho LTV and I have to say that I do not worry about long trips while driving anymore. Its super light and has the same type of air bladders as the chair cushions utilize. Another benefit is that is very potable, meaning if I head out with the boys to the bar I bring the cushion with me. Just throw it up on the bar stool and transfer to get my first drink. If there are people out there that are thinking of buying a new portable cushion I would recommend this cushion to anyone.

Here's some more info:

The LTV Seat™ from ROHO is a great little cushion that you can take with you anywhere! This folding, lightweight cushion is extremely portable, and is so versatile it can be used in a variety of settings. It can be used in the office, at sporting events, at home, in the car, and last but not least - with wheelchairs and mobility scooters.

This cushion is from the ROHO line called Shape Fitting Technology. It has dynamic air chambers that allow air to shift between cells, to better contour to your unique shape. The LTV Seat™ automatically adjusts to your movement, minimizing pressure and providing soothing comfort when you need it the most. The key to this cushion is the twist valve that allows you to make minute adjustments, and customize the air pressure to your exact liking. This cushion is a great choice for anyone who experiences pain after long periods of sitting.