b'optional featuresThe following are optional extras to the range.Lumbar SupportPolished Base Seat Tilt Seat SlideInflatableX-4D Arm Padadd 60 add 27 add 32 Lumbaradd 25add 37SynchroInflatable Ratchet BackFolding & Height TH234 TH230 MechanismSeat Pad AdjustmentAdjustable Arms with add 42 add 32 add 50MULTIFUNCTIONAL ARMS WITHOUT ARMS Ratchet Back Adjustmentadd 6945 www.airseating.co.uk'