8 mm drop: due to variances created during the development and manufacturing processes, all references to 8 mm drop are approximate. Air mesh. Blown rubber outsole. Dual density midsole. No-sew material application. Synthetic/TPU upper. These shoes were proudly assembled in our U.S. factories by our more than 1,200 U.S. workers. Since the domestic value is less than 70%, we have labeled them "Assembled in the USA."