This lower back support pillow relieves strain and stress in the lower back while you sleep or rest during the day to relieve stress as needed; The all important "S-Curve" is maintained at all times to help keep a healthy posture day or night; Self-molding, self-contouring memory foam surface conforms to your body s natural curves- relieving strain and stress. Zip off plush cover removes for easy care--wash & dry gentle.