These Fox River Work socks with copper are medium weight and have several features for those who wear work boots. A cushioned sole and reinforced heel and toe create a comfortable and durable fit. CuTEC Copper guards against odor and wick dry technology keeps feet dry which prevents blisters and hot spots. Fox River socks are guaranteed against manufacturing defects for 1 year and are proudly made in America. Specs: 41% copper CUTEC polyester, 38% polyester, 19% nylon, 2% spandex