New Balance NBx Marathon NS 1 Sock Nylon 75% / Polyester 21% / Spandex 4% Imported 75% Nylon, 19% Polyester, 6% Spandex Lightning Dry Moisture Management Seamless Toe with Friction Reduction Nylon and Left/Right Technology Machine was warm with like colors. Only non-chlorine bleach when needed. Tumble dry low. Do not iron. Do not dry clean. Do not use fabric softener or dryer sheets. China