The Sitback Rest® cushion promotes proper posture in any chair while providing support and comfort for your lower back. The side-support wings ensure ultimate comfort by helping keep you in the correct position. This backrest can be used at home, office or in your car. These back supports are made from precision-cut foam and have positioning belts that secure them to the chair. These lumbar cushions have earned the Health & Wellness Seal of Approval from the National Health and Wellness Club for ease of use, design and performance. Back rests measure 13 in x 14 in. The Standard model is covered with a durable cotton-blend cover and the Deluxe model features a plush polyester cover for added comfort.