Hh solutions ergonomics4work wave full mesh chair black high back mesh chair loaded with adjustable features to ensure a perfect fit 247 features adjustable ratchet back with lumbar support multi function height adjustable arms tilting headrest seat height adjustment synchro mech with seat slide free float lockable recline with tension control aluminium 5 star base full mesh 2 year warranty independently certified amp tested by sgs for 24 hour use specifications back width 520mm ba