The support system of an office chair consists of a frame, seat cushion, backrest, and armrests. Taking a PP (polypropylene) frame as an example, this thermoplastic resin material is lightweight and impact-resistant, capable of supporting the weight of the user while maintaining structural stability. The seat cushion is filled with high-density sponge, with density distribution controlled through a foaming process, resulting in a soft contact surface and ample deep support to alleviate pressure from prolonged sitting.
A high back design is a key feature of this type of product. The backrest height typically exceeds the shoulder blades, and combined with an adjustable headrest, it provides support for the cervical spine. The lumbar support features an arc-shaped raised design that conforms to the physiological curvature of the lumbar spine, distributing pressure on the lower back. Some models support headrest height and angle adjustment to accommodate users of different heights.