Ergonomic High Back: This home office chair is thoughtfully designed with an S-shaped high back that conforms to the curvature of your back and lumbar region while providing excellent upper back support. No more back fatigue from long hours of work or meetings. During breaks, you can relax on the 64.5cm/25.4" high back for maximum comfort Ultimate Comfort: Measuring 51cm/20" W x 50.5cm/20" D, the seat with extra foam cushioning offers a larger sitting area while relieving fatigue from a long time sitting. The soft padded high backrest and armrests add maximum comfort during your long work sessions Adjustable Seat Height: With the adjustment lever, the seat height can be easily shifted between 19 and 23 inches, allowing users to sit with their feet flat on the floor. This computer office chair also has a rocking function, which allows for relaxation during breaks Heavy-duty Gas Lift: With the SGS-certified gas lift, this big and tall executive chair is built in an impact and durable frame, which makes sure our users sit steadily in it Straightforward Instructions: All the hardware, connection parts and handy tools are provided in the product package. A detailed step-by-step illustration of assembling procedure is shown in the instruction