Temperature & pressure sensitive foam Molds to your body for maximum comfort Helps relieve back discomfort Adjustable straps for use on most chairs This back rest provides an ergonomic solution for back problems & is a comfortable support for your back. It has been designed to easeprevent lower back pain as well as improving general posture. The fabric cover can be washed. The adjustable straps mean that the back rest is suitable for use on most chairs.