Reduce muscle strain and fatigue by supporting your legs at an optimum angle. Height adjusts from 3.5'' to 5" to match your individual SmartFit™ comfort color. Angle adjusts 30 degrees and locks into place with a simple press of the foot. Features a non-skid surface. Width: 21.9"; Height: 14.2"; Depth: 3.7"; Color(s): Black.