Fellowes Compact Foot Rocker is ergonomically designed for maximum comfort. The rocking motion helps improve circulation while reducing leg fatigue. Flip product over to adjust height from 2.75" to 4". Unique tread holds footrest in place while in use. Easy to assemble. Perfect for use in the home, home office, office, school, or anywhere you need to sit for long periods of time. The foot rocker keeps you moving all throughout the day. Color(s): Black; Adjustability: Height; Surface Features: Tread Design.