This mesh Office Chair adjusts to fit most office requirements. Adjustable armrests are in 2-way adjustment or 3 adjustments. Additional ergonomic benefits include a locking asynchronous mechanism, mesh back with adjustable lumbar support, and 360°degree rotation. These Office Chairs come with a highly durable leg nylon reinforced fiberglass base with black, rolling, non-marring nylon casters and foam cushioning covered with durable nylon mesh fabric.