When choosing knee socks, as a rule, several parameters are valuable:

• foot length (cm): distance between the most protruding toe and most protruding parts of heel;
• foot girth (cm): foot girth in the vicinity of toe, near big toe bones and little toe;

Different knee socks size systems are used in various countries, the most common are as follows:

• International letter system (each range of foot length values ​​corresponds to a certain letter or letter combination, for example: XXS, XS, S, etc.);
• Russian number system (each range of foot length values ​​corresponds to a certain number, for example: 23, 25, 27, etc.);
• European number system (each range of foot length values corresponds to a certain combination of numbers, meaning shoe sizes in the European size system, for example: 38/39, 40/41, etc.);
• American (English) number system (each range of foot length values ​​corresponds to a certain number, for example: 8, 9, 10, etc.).

Important: more information on the main brand sizes is available at links below.