They do have little stains on the heal of the shoes. The HOKA Clifton Edge trainers have been designed for endless running sessions. Thanks to their combination of cushioning, excellent responsiveness and the brand's softest and lightest foam to date, they offer a concise ride and unique heel geometry designed to provide a soft impact and the feeling of sliding on the ground. The Clifton Edge is the culmination of all the HOKA innovations. Welcome to the future.