Designed for use with height-adjustable desks. Encourages movement of your feet and legs while sitting or standing, helping to reduce fatigue. Two different positions offer rocking to move your feet back and forth while sitting and stationary to place both feet on while sitting or one foot at a time while standing. A built in toe-lift makes it easy to flip back and forth between positions. Surfaces on both positions include 3M Safety-Walk Slip-Resistant Surface to keep your feet and the footrest securely in place. Strap lets you easily move the footrest or hang it up when not in use.