Stealth Studio The patented ZenWave motion technology allows you to float forward and backward without harmful pressure. The Active Tilt seat plate pivots smoothly forward and backward to promote proper body alignment. The "Free-Float" backrest stays with you as you lean forward, giving you continuous support. Customize your seat and backrest position simply with three lever adjustments. The convex shape of the "Free-Float" backrest massages and improves blood flow to your lower back.