FoxRiver Women's Her Thermal Boot Knee-High Socks 35% Merino Wool/35% Acrylic/28% nylon/2% Spandex Made in US Medium weight merino wool blend perfect for shorter activities and cooler weather Nylon-reinforced heel and toe areas add durability and longer sock life Proudly made in the USA, our exclusive Wick Dry technology keeps feet dry and warm Memory-knit contraction to keep shape TOASY WARMTH ON COOL DAY: Medium weight merino wool blend perfect for shorter activities and cooler weather MADE TO LAST: Nylon-reinforced heel and toe areas add durability and longer sock life STAY DRY ALL DAY LONG: Proudly made in the USA, our exclusive Wick Dry technology keeps feet dry and warm CUSTOM-FIT CONSTRUCTION: Memory-knit contruction to keep shape BACKED BY COMPANY STANDARDS OF EXCELLENCE: Fox River products are guaranteed against manufacturing defects for one year; products may be returned within one year with the dated receipt to the store where you purchased them or by following our FoxSox.com return process