For lower back support UltraForme Backrest support is most useful with medium sized chairs for optimal results. The UltraForme Backrest is scientifically proven to ease pressure on the lumbar discs and lower back muscles, reducing muscle activity in the lower back by up to 35%. Integrated handle and rear straps for use anywhere you sit - in the office chair or car or in the home. The biomechanically molded polycarbonate core structure is impact resistant. regularly $115