OSBC Original Apparel coming at ya! One size fits EVERYBODY!! There is no heel stitched in to define a size. Specifically designed for our riding boots & all the other boots that you have been collecting over the years. Made out of the BEST FABRIC you can put your toes & feet into, that I can promise you. Bamboo DOES NOT make your feet sweat & will retain the smell of leather when you take your boots off after a long day =) Definitely an amazing gift idea, not your average ordinary socks & we all know people who own a pair of boots.