Increase leg and back comfort while sitting at your desk. Ergonomically designed footrest provides optimum comfort as it relieves strain and muscle fatigue. Three-position height adjustment, from 4" to 6", allows you to find the height that's just right for you. Foot-adjustable easy-glide platform rocks your feet and adjusts tilt angle smoothly and quietly. Large platform has surface bumps that massage and soothe your tired feet while you work. Width: 18 in; Height: 4 in; Depth: 13 1/2 in; Diameter: N/A.