Installation/Other IssuesOur office chair package includes an installation guide, and detailed setup steps are available on our product page. For any questions regarding assembly or office chair usage, pls let us know. we guarantee a response within 24 hours. Adjustable Air Lumbar Support: Precision Fit for Spinal CurvesOur desk chair features an innovative inflatable lumbar system adjusts ±5cm via air pump for custom fit. High-resilience material provides dynamic support, reducing lumbar pressure by 25% + to ease stiffness. Space Maximization: 90° Flip-Up Armrest DesignFlexible storage, zero space waste. The computer chair armrests flip up vertically 90°, reducing chair width from 15.74 to 3.54 for easy storage under desks or in corners. Paired with 360° silent casters, clear your aisle instantly the ultimate space-saver for compact offices! Reclining Backrest with Rocking: 90°-115° TiltCradle-style relief. Ergonomic office chairs dual-axis mechanism supports recl