【Adjustable & Flexible Functions】SGS of Grade 3 Certified Gaslift, more safe and stable. The office chair allows smooth height adjustment and 360°rotation. Enjoy effortless reclining up to 30°with an adjustable tilt tension knob for customized comfort during breaks. 【Comfortable Cushion】Designed for long hours of sitting, this desk chair features a full block of thick, high-density foam that offers lasting support without collapsing. 【Ergonomic Backrest & Lumbar Support】The backrest follows the natural curve of your spine, providing optimal lumbar support. It helps promote healthy posture and reduces back strain, making it an ideal seating choice for home offices, study rooms, or teen workspaces. 【Durable Construction】Built with a strong internal wooden frame, molded nylon armrests, and a one-piece nylon base, the computer chair comply with EN 1336. The smooth-rolling casters move quietly and protect flooring, offering long-term durability and everyday stability.