Product name: Ergonomic office chair Mesh: Comfortable and breathable mesh Handrail: Rotating armrest Cushion: High-density sponge cushion Chassis: thick explosion-proof chassis Pneumatic rod: SGS safety certification Tripod: High-load-bearing nylon / steel tripod Chair Wheel: Silent Wheel Features: * S-shaped ergonomic backrest, using ergonomics to form an S-shaped backrest frame, which fits comfortably and improves back comfort * Top waist and spine elastic waist support, one-piece elastic waist support, soft and elastic to support the waist support back. * Polymer nylon frame, integrated die-casting, polymer nylon (PA) particle casting structure is stable, durable. * Polyester mesh, wear-resistant and dirt-resistant polyester mesh, three-dimensional honeycomb structure, flexible and flexible, breathable and comfortable. * Silent wheel, stable and unobstructed, care for the floor, non-slip and silent.