Short answer. size is the variant’s size as shown on your page, 1 to 100 characters, one value per product (small/medium/large only for a genuinely multi-size item, never a comma-separated list), required for Clothing and Shoes in free listings and in Shopping ads for Brazil, France, Germany, Japan, the United Kingdom and the United States. Do not send n/a or multisize.
| Attribute | size |
|---|---|
| Requirement | Required for Apparel & Accessories > Clothing and Shoes in free listings, and in Shopping ads for Brazil, France, Germany, Japan, the United Kingdom and the United States. |
| Format |
|
Google’s rules for size
- Submit only the size value, without terms like n/a or multisize.
- One size per variant; each size is its own row.
- Country size systems and size types have their own attributes (size_system, size_type).
Common mistakes, and the error each one becomes
- Clothing variants without a size. → Missing value [color] / [size] / [gender] / [age_group]
- All sizes listed in one row separated by commas.
Where the value comes from on a connected store
| Shopify | The variant option named Size. |
|---|---|
| WooCommerce | The variation attribute named Size or Größe. |
The free feed check reads this attribute from any feed file and reports the defects above; every check is listed.
Questions merchants ask
What about one-size products?
Google wants only the size value; “one size” is a value shoppers understand, and for Meta it is explicitly acceptable.
Do I write “Size M” or “M”?
M. Only the value, as your page shows it.
Can shoes carry width?
Yes; Google’s page describes formats for shoes with width and trousers with inseam.
Sources
- Size [size] — Google Merchant Center Help
- Fixing Merchant Center disapprovals for product data quality violations — Google Merchant Center Help