éPolyester mesh lining treated with Aegisa?? antimicrobial lining to keep your feet healthy and odor free. 4.5mm anatomical footbed with In-Boarda?? compression-molded EVA footframe and nylon 6.6 injection-molded arch shank. MerrellA? Air CushionA? midsole and Axis Vibrama?? sticky rubber outsole with 4.5mm lug depth. Slip lastedé