Currently Apex socks are one size fits all. The ExoFrame wraps to your feet ensuring that 'locked in' feeling. This means it fits a range of foot sizes:
UK: 7 - 8 - 9 - 10 - 11 - 12
US: 8 - 9 - 10 - 11 - 12 - 13
EU: 40 - 42 - 43 - 44 - 45 - 46