|S||4 - 6.5||5 - 8||39 - Below|
|M||7 - 9.5||8.5 - 11||40 - 42|
|L||10 - 12.5||11.5 - 14||43 - 45|
|XL||13 - Up||14.5 - Up||46 - Up|
Form and function. They are the best socks to run distance in and they have amazing patterns and designs. Wore them for every PR and every second counts.
They are excellent. As are all your products.