Hi, thank you for your inquiry! After taking a look at the listing it appears that there is a Balega size chart located in the images, for your reference. This listing, in particular, is for a size small Balega Silver Antimicrobial No-Show (grey/neon coral) in a size small. A Balega size small fits US Men's 4.5-6.5/ US Women's 6-8. I hope this information helps. Please let us know if you have any questions or if we can be of any further assistance.