Pure memory foam, contours to your body using heat responsive technology to target lower back discomfort while promoting a healthier posture. Unlike traditional flat cushions, our ergonomic back support is designed to mimic the natural curve of the spine, offering targeted support to you upper, middle, and lower back. With dual adjustable straps and included extensions, it fits a wide range of chairs up to 32" (81cm) in back width. Featuring a breathable mesh cover that's machine washable.