Breathable open cell mesh with synthetic overlays and TPU Midfoot Structure for extra protection A breathable, open mesh construction helps air flow, while the sturdy midfoot structure adds support Navic fit system delivers comfort and stability with a unique lace webbing system that keeps your heel in place for a more secure fit while running or hiking Techlite midsole provides elevated cushioning, stability, and energy return with extra light responsive foam, for long lasting comfort on any terrain.