The synchronized seat and back move in harmony with the user to provide continuous comfort. Seat glide adjustment moves the seat cushion forward or back to adapt to upper leg length. Waterfall seat edge promotes better leg circulation. Height- and width-adjustable arms for upper body support. Warranted for users up to 300 lbs. Upholstered front over charcoal ReActiv back. Utilizing all the comfort and supportive benefits of the ReActiv back, the upholstered ReActiv back features a fabric cover over the hexagonal back. This provides additional support along with a more conservative aesthetic and a variety of design options.