Best for walking and road running, the HOKA Clifton 9's uppers are comprised of engineered mesh with a padded tongue for breathable comfort. Using a slightly softer, more responsive foam than its predecessor, the 9 has a higher stack height, offers an enhanced underfoot experience and is fitted with an extended heel crash pad delivering shock absorption. Textile & Synthetic Upper/Synthetic Sole. The Clifton 9 showcases a new foam and improved outsole design to deliver a strong underfoot experience, ideal for road running and walking. True to size fit.