The Cobra (far left) is for heel heights greater than 2 inches. It fits in most women's shoes but isn't as supportive as other orthotics. The Graphite Dress (second from left) is lightweight but bulkier than the Cobra, and only works with shoes with less than a 2-inch heel, including men's shoes.  More supportive than the Cobra is the Holethotic (second from right) for heel...