3M Foot Rest for Standing Desks, 19.98w x 11.97d x 4.2h, Black

Footrest helps to reduce fatigue by encouraging the movement of your feet and legs while sitting or standing. Designed for use with height-adjustable desks, it features two different positions: 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 and carrying strap make it easy to change positions of the footrest or to move it around. Strap can also be used to hang footrest when not in use. Surfaces on both positions include 3M Safety-Walk Slip-Resistant Surface to keep your feet and the footrest securely in place.