I ordered 2 pair. One stated Large on the cardboard holder and the other stated Medium. I was reluctant to keep them, but the back sticker looked like it said L and I measured them with the other pair in Large and they seem okay. Not sure why this was labeled wrong.
These socks really keep your feet warm and dry. They are not too bulky and can be worn with most of your casual shoes and boots. My feet never feel cold when I am wearing these socks. I have several pair and wear them all winter long. Good purchase for comfortable feet!