The flexible, agile design of the WorkPro Momentum Mesh Active High-Back Chair is responsive throughout a wide range of movement and positions from top to bottom. The 3D headrest of the mesh office chair is adjustable for height, depth and left and right positioning. The 4D arms adjust up and down as well as forward and back, pivot inward and outward and adjust for width. When leaning to the left or right, the active back of the high-back office chair moves with you for body support and stability, reducing negative tension. The adjustable lumbar support mechanism offers up to 9 positions for optimum comfort in any posture. The office chair with a headrest features a seat that offers a molded cushion plus high-density foam with a memory layer on top.