The NMD_R2 mixes modern engineering with a vintage soul. These shoes have a knit upper that's built to flex and breathe, plus the responsive comfort of Boost. Outfitted for hot days Mesh lining features cool-touch yarn Sockliner with Outlast® technology helps regulate foot temperature Distinctive Boost midsole Boost is our most responsive cushioning ever Signature NMD details A signature heel pull plus EVA midsole plug