What is Size System [size_system] Product Attribute? Google Free Listings (2025)

Shoppers often rely on specific sizing systems to find products that fit their needs accurately.

The Size system [size_system] attribute ensures that your products are easily discoverable by clearly indicating which country's sizing standards they follow.

By providing this information, you help customers filter and find exactly what they're looking for in Google’s free listings.

What is Size System [size_system] Product Attribute?

The Size system [size_system] attribute allows you to specify the country-specific sizing system your product adheres to. Whether it’s US, UK, EU, or another recognized system, this attribute helps create accurate search filters. By detailing the size system, you enable customers to narrow down their search results to find products that match their regional sizing standards, ensuring a better fit and reducing the likelihood of returns.

What are Free Listings? Google’s free listings appear organically across platforms like Search, Maps, YouTube, and the Shopping tab—without requiring advertisers to pay for clicks. By accurately submitting the Size system [size_system] attribute, you ensure your products appear in relevant filters, making it easier for customers to find items that meet their specific sizing requirements.

When your product feed includes detailed size system information, Google can better categorize and display your products to users who prioritize accurate sizing. This increases the likelihood of your products being seen by the right audience, ultimately driving higher engagement and sales.

Where Does Google Merchant Center Fit In?

Google Merchant Center is the platform where you manage your product feeds, including attributes like title [title], description [description], size_system [size_system], and size [size]. By accurately filling out the size_system [size_system] attribute, you enhance the clarity and searchability of your listings. This ensures that your products are correctly filtered and displayed to users searching for specific size systems, thereby improving your visibility and competitiveness in the marketplace.

Minimum Requirements for Size System [size_system]

To ensure your products are eligible and displayed correctly in free listings, adhere to the following requirements:

1. Include the Size System: Clearly specify which country’s sizing system your product uses by selecting one of the supported values.
2. Align with Size Attribute: When you submit a size through the size [size] attribute, also submit the corresponding size_system [size_system] attribute to explain which system you’re using.
3. Single Value Submission: Provide only one value for the size system attribute. Ensure it accurately reflects the sizing standard your product follows.

Size System [size_system] vs. Other Attributes

Understanding how the Size system [size_system] attribute interacts with other product attributes is crucial for accurate listings:

A) Size System [size_system]

• Definition: Indicates the country-specific sizing system used for the product (e.g., US, UK, EU).
• Usage: Use to clarify which regional sizing standards the product adheres to, ensuring accurate sizing filters.

B) Size [size]

• Definition: Specifies the actual size measurement of the product (e.g., S, M, L, 32, 34).
• Usage: Use separately from size system to describe the size aspect, ensuring clear and distinct filtering.

C) Size Type [size_type]

• Definition: Describes the cut or fit of the product (e.g., regular, petite, plus, tall, big, maternity).
• Usage: Use independently to describe the fit aspect, without conflating it with size system or size.

By clearly distinguishing these attributes, you enable more precise search filters and better product categorization, enhancing the shopping experience for your customers.

Best Practices

Optimize your Size system [size_system] attribute by following these best practices:

• Match the Manufacturer’s Sizing: Ensure the size system aligns with the manufacturer’s specifications. If your product already follows a specific size system, submit the matching supported value.
• Accurate System Selection: If you have various products with different size systems, make sure to submit the correct size system for each product. Incorrect systems can mislead customers and reduce listing relevance.
• Combine with Size and Size Type: To provide comprehensive sizing information, also submit the size [size] and size_type [size_type] attributes. This combination helps customers understand exactly how the product will fit.
• Use Clear and Recognizable Terms: Avoid abbreviations or internal terminology that may confuse shoppers. Use standard terms like "US," "UK," "EU," etc., to ensure clarity.
• Ensure Consistency Across Feeds: Maintain consistent size system values across all your product feeds to avoid confusion and ensure accurate filtering.

Pro tip: Use an AI tool to optimize your product feed

Examples

Below are scenarios illustrating common mistakes and optimized corrections when using the size_system [size_system] attribute:

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Pro tip: See two Google product feed examples (from 2 different online stores)

Why the Right Size System Matters for Free Listings

Accurately describing the Size system [size_system] attribute enhances how Google categorizes and filters your products, making them more discoverable to customers who prioritize accurate sizing. When size systems are correctly submitted, your products can appear in more targeted searches, increasing the likelihood of clicks and conversions. Additionally, clear size system descriptions help set accurate customer expectations, reducing the risk of returns due to sizing mismatches.

Moreover, well-defined size system attributes contribute to a better shopping experience by allowing users to efficiently narrow down their search results based on regional sizing standards. This precision not only improves customer satisfaction but also enhances your store’s reputation for reliability and attention to detail.

Common Pitfalls & How to Avoid Them

Even experienced merchants can encounter issues with the size_system [size_system] attribute. Avoid these common pitfalls to maintain compliant and effective product listings:

• Using Abbreviations or Internal Terms: Always use clear, descriptive size systems that shoppers understand. Avoid shorthand or codes that aren’t widely recognized.
• Mixing Size System with Other Attributes: Keep size system descriptions separate from size, color, or pattern to ensure accurate filtering and categorization.
• Submitting Irrelevant or Vague Values: Only use the size system attribute if it’s a distinguishing feature of the product. Avoid non-specific terms that don’t describe a size system.
• Providing Multiple Values Beyond the Limit: The size system attribute accepts only one value. Submitting more than one will result in excess values being ignored.
• Ignoring Size Variants: If your product has multiple size system variants, ensure each variant is accurately described with its own size system value.
• Using Non-English Terms: Submit size system values in English to maintain consistency and ensure they are recognized by Google’s systems.
• Overlooking Important Size Systems: If the size system is a key feature that influences purchasing decisions, neglecting to include it can reduce your product’s visibility in relevant searches.

Related Attributes

Accurate data across product attributes ensures your listings are comprehensive and easily searchable. Monitoring potential issues in the Merchant Center’s “Diagnostics” or “Needs attention” tabs can help maintain the integrity of your product data. If you utilize structured data on your website, map relevant fields to schema.org properties for enhanced compatibility. Below is a table of attributes—those marked as Required apply to free listings when relevant, while recommended ones can further improve your product’s discoverability.

FAQs About Size System [size_system]

Does adding a size system attribute improve my product’s ranking?

Yes. By specifying the size system, you enhance the relevance of your listing for users searching for products that fit their regional sizing standards, such as “US size jeans” or “UK size dresses.” This targeted matching can increase your product’s visibility and click-through rates, as shoppers are more likely to engage with listings that meet their sizing needs.

What if my product doesn’t have a specific size system?

If your product doesn’t follow a specific regional sizing system or if sizing isn’t a critical factor for the product, you don’t need to use the size_system [size_system] attribute. Only submit this attribute when the size system is a significant feature that distinguishes your product from others.

Can I submit multiple size systems for one product?

No. The size_system [size_system] attribute accepts only one value. If your product needs to cater to multiple size systems, consider creating separate listings for each size system to ensure accurate filtering and categorization.

Should I include the size system in the product title or description as well?

Yes. While the size_system [size_system] attribute helps with filtering and search accuracy, including the size system in the product title and description can enhance clarity and ensure that shoppers understand which sizing standards the product adheres to.

How specific should the size system descriptions be?

Use clear and specific terms that accurately describe the size system. For example, use “US” instead of “American” or “EU” instead of “European” to provide a precise description that shoppers can easily understand.

Can I use non-English words for size systems?

No. Submit size system values in English to ensure they are recognized and processed correctly by Google’s systems. Using non-English terms can lead to misinterpretation and reduce the effectiveness of your listings.

How often should I update the size system attribute?

Update the size_system [size_system] attribute whenever you introduce new size system variants or make changes to existing ones. Regular updates ensure that your product data remains accurate and relevant, maintaining high visibility in search results.

What if my product’s size system changes over time?

If the size system of your product changes (e.g., switching from US to EU sizing standards), update the size_system [size_system] attribute accordingly to reflect the new sizing system. This keeps your listings accurate and ensures they appear in relevant searches for the updated size system.

Conclusion

The Size system [size_system] attribute is essential for accurately describing the country-specific sizing standards of your products, enhancing their visibility in Google’s free listings. By providing clear and specific size system information, you enable customers to find products that match their regional sizing needs, improving search relevance and increasing the likelihood of conversions.

Ensure that you only submit the size system attribute when it’s a distinguishing feature and that the descriptions are clear and accurate. Avoid common pitfalls like using abbreviations, mixing attributes, or submitting irrelevant values. By following best practices and maintaining accurate product data, you can enhance the shopping experience for your customers and boost your store’s performance in a competitive online marketplace.

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