Lifetime Warranty Spring Seat Construction Solid Maple Construction Replaceable Components Infinite Back Adjustment within comfortable range Pneumatically Controlled Wallsaver Leg Plastic Rubber Cushioned Glides Low Formaldehyde Emissions Molded Black Urethane Arm Cap Nemschoff Healthcare finishes for heavy use and harsh cleaning Certified to meet CTB 133/ASTM E-1537 with most fabrics