※ I purchased this as a spare, but I no longer wear heels, so I'm selling it. This insole for high heels was developed based on the results of Dr. Howard Dananberg, a leading American podiatrist, who analyzed the symptoms of many women he had examined! Insolia is recognized by the American Podiatric Medical Association for promoting foot health and has been awarded a certificate of approval. Its effects are reputed to be "like magic," and it is loved by many women around the world who suffer from the pain of heels.