Fox River Men's Lightweight Merino USA-made Socks 2% spandex 57% Merino wool, 41% nylon, 2% spandex Machine wash Memory-knit construction throughout helps sock keep its form, wash after wash. Contoured rib top holds sock in place to eliminate slippage. Spandex compression zones add support and keep sock in place all day long. Made in Osage, Iowa