Push the pace in the BrooksMach 18 racing flats. 3D Fit Print overlays provide structure and flexibility. Ultra lightweight mesh upper with microfiber internal support for a sock like fit. Compression molded EVA midsole provides long-lasting cushioning. Pebax Rnew outsole plate for snappy response and a faster run. Aggressive rubber lug pattern enhances traction. Wt. 4.6 oz.