Ethylene Vinyl Acetate sole ROOMY TOE BOX extra room for comfort and better blood circulation. FRONT ROCKER SOLE with a supported midfoot. REMOVABLE INSOLES to accommodate custom orthotic support. DURABLE BREATHABLE MESH breathable seamless mesh construction that provides proper ventilation & flexibility. Free Corrective Fit Orthotics included – Orthotics provide full-body alignment and perfect biomechanics.