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WearableSizeSystemEnumeration

WearableSizeSystemEnumeration is a schema.org Enumeration for the sizing system that an apparel size value belongs to. It is the value of SizeSpecification.sizeSystem. Schema.org introduced this enum (GitHub issue #2811) to disambiguate "size M" across markets where M means different measurements.

It has 14 members (country / regional systems):

  • WearableSizeSystemAU (Australia), WearableSizeSystemBR (Brazil), WearableSizeSystemCN (China), WearableSizeSystemDE (Germany), WearableSizeSystemEurope (generic EU), WearableSizeSystemFR (France), WearableSizeSystemIT (Italy), WearableSizeSystemJP (Japan), WearableSizeSystemMX (Mexico), WearableSizeSystemUK (United Kingdom), WearableSizeSystemUS (United States).
  • WearableSizeSystemContinental: generic continental European sizing.
  • WearableSizeSystemEN13402: the EN 13402 metric standard.
  • WearableSizeSystemGS1: GS1 industry standard.

Use with SizeSpecification.sizeSystem, SizeSpecification.sizeGroup (WearableSizeGroupEnumeration), and a plain name (the size label itself — "M", "38", "10").

Full example of schema.org/WearableSizeSystemEnumeration json-ld markup

The markup is verified as valid with Rich Results Test from Google.

schema.org/WearableSizeSystemEnumeration
<script type="application/ld+json">
{
  "@context": "https://schema.org",
  "@type": "Product",
  "name": "XooTee Classic — Men's Medium (US)",
  "size": {
    "@type": "SizeSpecification",
    "name": "M",
    "sizeSystem": "https://schema.org/WearableSizeSystemUS",
    "sizeGroup": "https://schema.org/WearableSizeGroupMens",
    "suggestedMeasurement": { "@type": "QuantitativeValue", "name": "Chest", "value": 40, "unitCode": "INH" }
  }
}
</script>

Minimal valid version

The smallest markup that still produces a valid WearableSizeSystemEnumeration entity. Use it as the floor. Reach for the advanced example above when you want search engines and AI agents to understand more about your content.

schema.org/WearableSizeSystemEnumeration (minimal)
<script type="application/ld+json">
{
  "@context": "https://schema.org",
  "@type": "SizeSpecification",
  "name": "M",
  "sizeSystem": "https://schema.org/WearableSizeSystemUS"
}
</script>

Google rich results this unlocks

WearableSizeSystemEnumeration is a structural type. It does not produce a rich result on its own.

Its value comes from combining it with a primary type whose markup earns a rich result (Article, Product, Event, and so on). WearableSizeSystemEnumeration becomes the trunk that the primary type branches off viamainEntityorbreadcrumb. Include it on every page as the backbone of your markup.

Common WearableSizeSystemEnumeration mistakes

Mistakes that pass validation but silently fail to earn rich results or mislead consumers walking the graph. Avoid these and your markup will be ahead of most sites in the wild.

  1. 01

    Ambiguous size with no sizeSystem

    Wrong
    "size": "M"
    Right
    Typed SizeSpecification with name + sizeSystem

    A bare 'M' could be US M, UK M, or JP M — three different measurements. sizeSystem resolves the ambiguity.

  2. 02

    Inventing sizeSystem URLs

    Wrong
    "sizeSystem": "https://schema.org/WearableSizeSystemIndia"
    Right
    Use one of the 14 defined values; for countries without a dedicated enum, use the closest match or EN13402

    Invented URLs do not resolve in the vocabulary.

Schema properties in this example

WearableSizeSystemEnumerationEnumerationWearableSizeSystemAUWearableSizeSystemBRWearableSizeSystemCNWearableSizeSystemDEWearableSizeSystemEuropeWearableSizeSystemFRWearableSizeSystemITWearableSizeSystemJPWearableSizeSystemMXWearableSizeSystemUKWearableSizeSystemUSWearableSizeSystemContinentalWearableSizeSystemEN13402WearableSizeSystemGS1SizeSpecificationsizesizeSystemsizeGroupWearableSizeGroupEnumerationWearableSizeGroupMenssuggestedMeasurementQuantitativeValueunitCodeProduct

About the example data

The XooTee Classic Men's Medium in US sizing.

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