Discover Topo's lightest and fastest shoe ever. The new upper features an airy mesh for excellent breathability, with a fit so light and secure it disappears around the foot as you move. The new full Pebax Powered® performance midsole delivers a highly responsive, seriously lightweight, and energetic ride. The rocker design aids in a fast transition, while the lightweight die cut rubber outsole offers weight relief with optimal traction and durability.