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.