Solemate Plus Adjustable Footrest With Smartfit System, 21.9w X 3.7d X 14.2h, Black Reduce muscle strain and fatigue by supporting your legs at an optimum angle. Angle adjusts and locks into place with a simple press of the foot. Non-skid surface. Reduces pressure on your lower back when set to your SmartFit® personal comfort color. Height adjusts from 3.5'' to 5'' and angle adjusts up to 30° for personal comfort.