Get lightweight support during a smooth and comfortable run in the Topo Athletic Ultrafly 4. A lightweight, resilient and responsive ZipFoam™ midsole gives you comfort every step of the way, while the new upper is more sustainable and provides a better fit. The Ultrafly 4 comes with Topo’s signature wide toe box and a snugger midfoot that allows your toes to splay, giving you better balance, stability and power This shoe gives you light stability that is perfect for those who have flexible arches or overpronation. The rearfoot is nice and stable thanks to a redesigned external TPU heel counter combined with a traditional EVA medial post, while the forefoot is still nice and flexible to give you great push-offs. Whether you are walking or running, the Topo Athletic Ultrafly 4 will give you everything you need to stick to your fitness routine.