Perpetual Nesting Chair offers a unique, passive ergonomic frame with independent seat and back flex. This dynamic seating solution automatically responds to you to enhance comfort and continual support. Design features passive back motion and fully upholstered, padded seat and back. Armless chair nests to 7-1/2" deep. Four casters provide complete mobility. Chair is certified by SCS to be in compliance with specific indoor air quality emission requirements. Meets or exceeds ANSI/BIFMA and ISTA performance standards.