The Fox River Mills Pioneer Crew Sock features Eco fibers that help wick moisture up to 30% faster than Merino wool alone. Go ahead, see what's around that next bend. Memory knit construction holds 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. Vented panels remove moisture and keep feet dry. Reinforced toe and heel add comfort and extend sock life. Made of 33% merino wool, 33% acrylic, 32% nylon, 2% spandex. Made in USA.