Lifetime Warranty Spring Seat Construction Solid Oak Nemschoff Mortise and Tenon Low Formaldehyde Emissions Nemschoff Healthcare finishes for heavy use and harsh cleaning Certified to meet CTB 133/ASTM E-1537 314B Back Chair Therapeutic Position to Minimize Back Pain 314H Hip Chair Therapeutic Position to Prevent Hip Over Extension 314H and 314B Adjustable Footrests