Back-of-heel cushions help keep heels from slipping in and out of shoes. They are made with PORON performance cushioning which help prevent friction, help prevent blisters from forming and help protect and cushion the sensitive heel area. These multifunctional cushions can also be used at top of mules, flats or boots and help with sizing/fit issues. Heavenly Heelz are recommended by the American Podiatric Medical Association. Apply cushion directly inside your shoe with the adhesive back. One pair per package.