I was having with my feet arch, the sales person came to the conclusion after examine that the strengthener would be able to alleviate my arch issues, but instead it got my feet tired, aching, and very painful. And in less than 20 minutes I had to remove them, my feet was actually turning inward, and hurt all that night, I told my diabetic dr. about these issues, he said removing them was the best action, that was not the best move, being a diabetic patient. $160.45 for less than 20 minutes was too much, and ended with more pain and feet turning inward because of the strengthener w459. I purchased them a few months ago, only used for less than 20 minutes. Never be fooled again. Dissatisfied 😒