This product is designed to provide optimal lumbar support and thoracic support. The back is height adjustable to suit the individual. Very light at 1.6kg (3.5lb) it folds for easy carrying with the built in handle. For use in any seat or chair, anywhere, to provide spinal support and to relieve / prevent back ache and low back pain. For travel comfort it is especially invaluable. What Car magazine tested 12 back supports in cars and gave the Backfriend (their only) 5 star rating. They said the Backfriend is the only one we recommend: it can make a bad seat good. Beautifully designed to allow freedom of movement; excellent support while avoiding pressure points. Highly recommended.