Ignition 2.0 Reactiv Mid-Back Task Chair, 17.25" to 21.75" Seat Height, Basalt Fabric Seat, White BackReActiv mesh back design delivers total zonal comfort with the perfect balance of the right type and right amount of support. Advanced synchro tilt mechanism with seat slider offers a full range of reclining positions. Tilt tension controls the rate and ease of recline and the upright tilt lock secures the chair in the full upright position. Unique, back cushion style lumbar support is height adjustable: up and down, to provide personalized support