I only buy Darn Tough socks nowadays. Their guarantee is unbeatable and they are super comfortable. However, I like these much less than their other crew wool offerings. These have a sort of strange heel construction that is almost square for lack of a better description. I am a size 11.5 and I tend to order XL in their crew offerings. However, I would order L for these ones in the future, they seem to be more true to size.