Encourages proper alignment of the pelvis and thighs, evenly distributing body weight for extended sitting comfort. Our unique design cushions your tailbone, sitting bones and thighs to help alleviate pressure points and assist circulation. Polyurethane foam construction absorbs compression forces and dissipates the vibration created in moving vehicles, making it ideal for use on the road. Can be used on its own or with any Obus Forme Backrest support to create a complete and comfortable ergonomic sitting experience. The removable front section is easily unzipped to allow for use with narrow chairs and benches.