The M57 series is an improved version of the M18 series.The biggest change of the M57 is that the seat cushion uses a PE polyester mesh, so it is not only soft but also very breathable.The design of the waterfall cushion and the sponge in front of the cushion can effectively relieve the pressure on the thigh and reduce the pain in the thigh.The improved armrest can be moved up and down, front and back, and left and right, so that it can better meet the actual needs of users.In addition, the original design is still retained, the PU casters that do not damage the floor, the adjustable lumbar pillow and other ergonomically designed functions.