Frameless Flex Back gives high performance elastomeric Flex Back Net cradles your back, providing integral lumbar support, and figure 8 structure enables multidimensional movement. Offers 270 degrees of seat edge with a buoyant two-piece cushion and nest structure. Continuous lumbar support from the back into the arms to support side sitting. Dynamic Suspension offers weight-compensated, synchronized recline. Flex Top folds over as armrest for side sitting. Chair Height Adjustment, Adjustable Seating Slider Depth. Tilt Preference Selector offers three ranges of recline movement. (item #53940)