Support your feet and encourage motion to improve circulation and back comfort. Active movement for greater mobility - The support adjusts to your movements. Light or heavy tension setting to adjust the ease of movement. Two height settings for sitting and standing. Change height positions with effortless foot adjustment. - Non-slip surface - Active movement feature - Hands-free adjustability - Height range: 12 - 17.5 cm and 17.8 - 21.8 cm