68% Polyester/27% Cotton/4% Spandex/1% Nylon. 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. Stability Fit Arch Support & Hold. Lightning Dry Moisture Management. Heel Pocket Fit. Comfort Toe Seam.