The footrest moves with the user and promotes movement in the feet to improve circulation and comfort in the back. Effortless hands-free height adjustments in 2 levels for use while sitting (11.4 - 16.5cm) and standing (19.1 - 21.6cm). Two tension settings to adjust sensitivity to movement. Non-slip surface for maximum comfort. Elegant aluminium base with real wood surface. Meets... the ergonomic requirements for office activities with visual display units confirmed by FIRA Int. Ltd, an independent ergonomics accreditation body (ISO 9241-5:1998).