Hh solutions ergonomics4work wave xtra chair blue features contoured posture chair for extra comfort and support soft touch yidartex fabric with headrest inflatable lumbar support contoured cushion amp waterfall seat height adjustable back amp seat multi functional arms synchro mech with seat slide blue with aluminium base 2 year warranty independently certified amp tested by sgs for 24 hour use specifications back width 490mm back height 605mm 65mm adjustment total height inc h