By improving posture, increasing blood flow, and reducing pressure, you can be healthier when you sit. It works on any type of seat, from car seats to hard bleachers. Its contoured design relieves pressure on the hips so they remain upright in proper alignment, reducing stress on the lower back. The ComfortSeat won't absorb moisture or generate heat. In fact, it's made from waterproof closed-cell EVA material for easy cleaning. Its patented design reduces seat surface temperatures and relative humidity by providing continuous airflow for ultimate comfort. Each ComfortSeat includes a washable, removable fabric cover (available in black only).