The SIHOO Doro C300 ergonomic office chair offers advanced support and comfort with features like an adjustable headrest, adaptive lumbar support, 3D armrests, a dynamic tracking backrest, and breathable mesh fabric, making it ideal for all-day use. Its innovative backrest adjusts dynamically to your movements and includes four adjustable height levels, while the armrests and lumbar support synchronize with your body to reduce pain and improve posture. The chair provides a customizable experience with a 3-position tilt adjustment (110°, 120°, and 130°) and an intelligent weight-sensing device for smooth, balanced reclining. Built with a 4-stage pneumatic lifter and certified for safety and quality by TUV, SGS, and BIFMA, it ensures durability, backed by a three-year warranty with free part replacements.