The Fellowes 8024002 Foot Rocker is ergonomically designed to promote comfort in areas with restricted work space. Its rocking motion helps to improve circulation and reduce fatigue. The height of the foot rocker can be easily adjusted from 2-3/4" to 4" - simply by flipping the product over. The unique tread design holds foot rocker in place while in use. The packed flat is used to reduce environmental impact and easy to assemble.