The SitSmart Relief relieves lower back pain by improving your posture. It features a brushed black polyester fabric covering, filled with a layer of pressure relieving foam padding for added comfort, providing all-day posture support to keep you feeling comfortable for hours. This simple posture corrector works in any type of seat, from office chair to car seats, even hard bleachers. Its patented design works by tilting your hips upright and comfortably floating your spine over the seat.