If you are making an enquiry about purchasing a Posture Friend, please include your name and details about your height and weight.   If you are considering a Posture Friend PRO and aren't quite sure, you are also welcome to send a photo of your seat or chair and I can let you know if you are on the right track. Note that Posture Friend PRO & AIR are designed to improve high-back chairs and seats (which support into the very upper back - such as a car seat, office chair or lounge/recliner).