The size of socks is usually based on the UK, US, and European sizes.
1. UK size: indicated by “S”, “M”, “L”.
2. US size: indicated by “W”, such as “W28” for size 28 and “W34” for size 34.
3. European sizes: indicated by “38”, “39”, “40”.
When purchasing socks, you can choose the corresponding size based on your foot length and foot width.