Office Desk Chair with Lumbar Support - X913OC360 swivel office chair with high density sponge and waterfall edge seat. Durable metal base and casters allow smooth movement while protecting floors. High back ergonomic design with widened shoulder support and adjustable lumbar. Backrest tilts from 90110 with 4 lockable positions for flexible seating. 2D adjustable headrest and 3D armrests support various body types and postures. Sliding seat cushion offers adjustable depth for proper thigh and