FoxRiver Everyday Bilbao Crew Medium Weight Merino Wool Socks 70% Merino Wool/29% Stretch Nylon/1% Spandex Made in US Reinforced toe and heel add comfort and longer product life; Proudly Made in the USA Spandex compression arch holds form and provides support Reinforced toe and heel add comfort and longer sock life Fully cushioned sole absorbs shocks and insulates Medium weight