Manufacturer claims it relieves Plantar Fasciitis pain. It also tells where they are staying for a longer period of time to get your feet used to it. I was fed up with them for about 2 1/2 months and all they caused was more pain. I tried to return them but was refused as the return period had expired despite the product being defective and not working as promised. If you buy them for this problem, they may not work for you.