Lightweight synthetic leather. Alpinestars Pit Shoes feature injection molded TPU heel counter for impact protection. Outer ring air bag for heel-strike cushioning and support. PU molded heel Midsole for maximum durability and cushioning. Injection molded arch support for greater support and stability. Internal PU molded Midsole. Ultra thin forefoot outsole for greater flexibility and reduced weight. Huh? All that for a pair of shoes? We gotta say, these walking shoes are some of the best shoes we've ever worn. Very light yet substantial, form fitting but fully ventilated. Just plain comfy.