Topo Athletic Ultrafly Running Shoe - Men's Synthetic The Ultrafly, named 2016 Runner's World Best Debut, is perfect for runners seeking cushioning and light support. It features strategically placed printed overlays and molded foam heel stays to secure the foot over a 28/23mm, 5mm drop platform. The 3-piece EVA midsole provides light guidance and feedback through the gait cycle. Topo Athletic recommends sizing up half a size. Strategically placed printed overlays for increased security and reduced weight. Molded foam heel stays for added security The 3-piece EVA midsole is engineered for runners seeking cushioning and light support, and provides light guidance and feedback through the gait cycle. Usage Recommendation: Road running