Ergonomic ' Tulip' design backrest with 3dimensional curvature Lumbar & spine support Height adjustable ratchet backrest Sculptured posture curved seat with waterfall front Fitted with seat slide Multi set mechanism for gas seat height adjustment Permanent contact backrest & forward seat tilt Fully adjustable arm rests Sturdy nylon 5 star base with twin wheel hooded castors 1 Year manufacturer's guarantee Delivered flat packed for easy self assembly