Do I need to indicate the size system used for my products?

size_system identifies the sizing system, such as FR, IT, EU, UK or US. French size 40 and Italian size 40 do not necessarily indicate the same measurement.

This attribute is optional in Google's specification; without it, Google uses the target country's system. Supply it when that default would not correctly describe your products.

Under Apparel feed options, enable size-system tags and map each category to its actual system. Save and inspect XML size_system.

The standard edition applies mapping according to the product's default category. A system does not automatically convert sizes or describe fit. See size and size_type. Check Google's accepted-value list before using a system absent from these examples.

The FR size system is assigned to default category Clothes > Men.
The FR size system is assigned to default category Clothes > Men.

For detailed requirements: Official Google documentation.

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