ADJUSTABLE CHAIR: 360° swivel office chair provides easy and comfortable mobility, overall height: 33.1 inches - 37.8 inches; adjustable height range: 4.7 inches. Seat-to-floor height: 17 inches - 21.7 inches. Adjustable seat height ensures optimal comfort and support ERGONOMIC ARMLESS CHAIR: Y-shaped lumbar support and ergonomic backrest conform to the curve of the spine, providing sufficient support for the spine, relieving lumbar pressure, and relieving back pain for long-term sedentary office workers BREATHABLE MESH AND THICKER SEAT CUSHION: High-density mesh wraps around the backrest and seat cushion to keep you cool, comfortable and relaxed. High-precision foam cushion provides a comfortable using experience GREAT QUALITY MATERIALS: Our office chairs are made of quality materials, sturdy frames to withstand large weights and quality fabrics for comfort and style EASY TO ASSEMBLE: We provide installation instructions and do our best to minimize your installation worries