Thickened waist design, curved chair back, support back, alleviate the problem of sedentary backache. Engineering support armrests. The back of the chair is integrally formed, durable, and selected high-grade leather fabrics. High resilience and full sponge filling, full-covered sitting feeling. The chassis tray is thickened and reinforced, and the high-quality gas piston base has a higher safety factor. Strong load-bearing five-star casters, with greater contact with the ground, stronger load-bearing, and load-bearing capabilities.