Features: 1. Comfortable, contoured-round seat cushion. 2. Two-way adjustable backrest. Allows vertical alignment for proper lumbar support and dynamic horizontal adjustment. 3. Seat height adjustment. Provides a seat height range of 13.8" to 22.4" (350 mm-570 mm) 4. Five-leg cast steel base. Adds increased stability. 5. Smooth running dual revolving castors 6. Roll edge helps reduce pressure on the legs and allow for proper circulation.