MULTIFUNCTIONAL ADJUSTMENT: In addition to the lumbar support and headrest adjustment, the office chair can switch to rocking mode (90°-115°), 10cm height adjustment and armrest surface adjustment (4cm, 15°) with a single click, so as to provide support to different postures and seat heights. STABLE AND STABLE CONSTRUCTION: The pressure gas springs of the ergonomic office chair are BIFMA and SGS certified. The sturdy star-shaped base provides extra stability, is rust free and resistant to ageing. 24 inch wheels rotate 360° and glide quietly, ensuring a peaceful working and living environment without leaving scratches. COMFORTABLE AND BREATHABLE: The backrest is made of a special nylon mesh with high elasticity, breathable and sturdy. The seat cushion is made of sturdy board, high density foam and high elastic latex, covered with elastic mesh, which keeps the user cool providing sufficient support and not easy to deform, offering great comfort. Optimal comfort range: Recommended for users weighing ≤90kg and height ≤180cm (according to seat size and ergonomic design). Exceeding these intervals may result in reduced lumbar support, limited adjustability or impaired comfort. Attention: To ensure the quality of the product exactly as described, we recommend that you select items shipped from LIMBALAY.