The Energizer Foot Support from Fellowes is a well-built adjustable non-locking foot rest. The large 13.25" deep footplate tapers from 18" wide at the top to 16" at the bottom. The 3-D foot plates on either side are shaped to match the natural contours of the soles for which reason the Energizer Foot Support is best used without footwear. The textured surface of the footplates can serve to provide a massaging affect on the soles of the feet. Three platform height settings are available (4", 5.25", and 6.5") each offering different ranges of free-floating tilt angle (-15° to +13°, -25° to +16°, -30° to +29°) respectively. Rubber grip feet will keep the footrest securely positioned on both hard and soft flooring surfaces.