Dexter's THE 9 bowling shoes have a patented interchangeable sole design that requires specialized THE 9 soles. THE 9 Soles feature Hyper Flex Hinges to help align the sole to the shoe properly in the Hyper Flex Channels. The Toehold Clip is comprised of an abrasion-resistant material that was created to resist toe drag damage. These soles are available in a variety of materials for different slide preferences.