93% Polyester, 4% Nylon, 1% Spandex. NB DRY moisture management technology quickly moves sweat to keep feet cool and dry. Breathable mesh panels promote airflow to keep feet feeling dry and cool. Stability Fit built in for enhanced arch support. Sport no show design. Stability Fit Arch Support & Hold. Lightning Dry Moisture Management. Breathable Mesh Venting. Heel Pocket Fit.