Tilt controls for optimal positioning. Synchro tilt allows you to recline your backrest and seat at a 2:1 ratio, or if you prefer, recline your seat and backrest simultaneously at the same ratio using the adjustable tilt angle. Control the amount of effort it takes to recline with the tilt tension adjustment. Adjustable lumbar cushioning supports your lower back and enhances the natural curve of your spine. The adjustable back height allows you to raise or lower the seat back while the adjustable seat back depth lets you move it forward or backward to position the lumbar support in the perfect spot!