The Ergo-Tech Wheelchair Seat provides a comfortable and healthy sitting experience for all day comfort! The contoured design adjusts your hips to proper alignment, reducing stress on your lower back and taking pressure off of both your hips and back. Ergo-Tech has an innovative bottom surface that dynamically contours under body weight, as well as distributes weight and ultimately reduces peak pressure by 70%! This therapeutic wheelchair seat uses a port and pillar design to promote airflow and reduce surface temperatures and relative humidity of your seat. When it is time to clean your seat, BackJoy has constructed this seat with durable, closed-cell EVA that is waterproof and heat resistant up to 180?! That means you can easily throw your Ergo-Tech Seat in the dishwasher and forget about it!