The product does not work adequately to prevent hyper-extension of the knee, which was the only reason that it was purchased. The product and its description clearly does not comply with the Trade Practices Act, and has been completely useless for the my wife's recovery from knee replacement surgery. As noted, it was only bought specifically because the description stated explicitly that it would assist in stopping hyper-extension. At this task, it was unsatisfactory. Your products are normally good, but not in this case. I would given zero stars if this has been an available score.