5 caster base for safety,UPS shippable,High density foam padding for comfort and long life,Quick and easy to assemble,10-year warranty on parts,Tilt Swivel with tension control and lockout feature,Pneumatic height adjustment,Contoured seat and back with lumbar support,Fire retardant foam padding,Heavy duty upholstery,Twinn wheel heavy duty casters,Meets or exceeds ANSI/BIFMA standard