Generally speaking, office chairs below the $100 mark are meant for occasional use. Typically, they are low-back to mid-back task chairs made primarily of plastic. Although they often feature some padding for extra comfort, they rarely include lumbar support or contoured cushions. They will occasionally include arm rests, but rarely will those arm rests be adjustable. In fact, the only adjustment typically included in a chair of this price range is adjustable seat height.
Due to their lack of adjustability, most people do not find these chairs comfortable for extended periods of time. If you are looking for an extremely comfortable, ergonomically-friendly all-day office chair, you may want to look into something from a higher price range. Chairs under $100 are best used occasionally and for short periods of time, for example, as a chair for office guests or as an addition to your child’s at-home study zone.