{
  "id": "E03",
  "url": "https://cartforagents.com/guides/winter-clothing-product-data",
  "title": "Winter clothing product data: temperature ratings, scope and fit",
  "description": "Publish temperature units, activity and layering conditions, garment fit and rating provenance; use our corrected matcher example as a warning.",
  "answer": "State each temperature rating as a signed number with its scale, such as -30 °C (-22 °F), and say which part of the garment it covers, the activity and layering it assumes, and who set it; then give body measurements for every size, not only age labels. In a Shopify catalog search for a toddler snowsuit rated for minus 30, two listings stated -30 °C, one of them only for the hood's insulation, and Shopify's generated spec list dropped the word hood.",
  "take": "Scope is the fact winter brands forget. \"-30 °C\" means little if a shopper can't tell whether it covers the whole suit or the hood, so say which, and under what conditions.",
  "summary": "\"Rated to -30 °C\" can mean the whole suit or only the hood. Write down the scope, the conditions and the size measurements so nobody has to guess.",
  "claims": [
    {
      "text": "For the search \"toddler snowsuit rated for minus 30\", the position 2 title says \"protects to -30 °C\". Its description separately says \"Temperatures ca. 0 - -30 °C\" and, in the seller's activity guidance, \"generally being outside in temperatures around -10°C to -30°C\". This record carried no Shopify-generated metadata.",
      "source_title": "Cart for Agents: Receipts cited by our guides (Shopify agent-catalog snapshot, Oct 26, 2026)",
      "source_url": "https://cartforagents.com/research/agent-shopping-research#receipts-cited-by-our-guides",
      "source_date": "2026-10-26",
      "method": "observed",
      "limitation": "Three separate statements in one record, not one range. We did not check them against the manufacturer or test the garment."
    },
    {
      "text": "In the same result, the position 9 description rates \"a hood with [brand] insulation\" to -30°C. The Shopify-generated spec line in the same record says \"Insulation: [brand] rated to -30°C\", without the word hood.",
      "source_title": "Cart for Agents: Receipts cited by our guides (Shopify agent-catalog snapshot, Oct 26, 2026)",
      "source_url": "https://cartforagents.com/research/agent-shopping-research#receipts-cited-by-our-guides",
      "source_date": "2026-10-26",
      "method": "observed",
      "limitation": "One record. The rating for the rest of the garment is unknown to us; we did not inspect the product or its documentation."
    },
    {
      "text": "Our first text matcher reported both -30 °C listings as missing a rating because it did not treat \"minus 30\" and \"-30 °C\" as the same value.",
      "source_title": "Cart for Agents: Receipts cited by our guides (Shopify agent-catalog snapshot, Oct 26, 2026)",
      "source_url": "https://cartforagents.com/research/agent-shopping-research#receipts-cited-by-our-guides",
      "source_date": "2026-10-26",
      "method": "observed",
      "limitation": "An error in our own tool, corrected October 26. It does not show whether any AI shopping agent makes the same mistake."
    },
    {
      "text": "In the same result, a temperature figure appeared in 1 of 10 titles (position 2), 2 of 10 descriptions (positions 2 and 9) and the Shopify-generated metadata of 1 of 10 listings (position 9). The other 8 descriptions described warmth in words only or not at all. Only the position 2 description tied its temperatures to activities, and none of the 10 descriptions said what to wear underneath.",
      "source_title": "Cart for Agents: How we checked (winter outerwear data)",
      "source_url": "https://cartforagents.com/guides/winter-clothing-product-data#how-we-checked",
      "source_date": "2026-10-26",
      "method": "observed",
      "limitation": "One search, one unpersonalized snapshot; six of the ten listings came from one seller. Describes what was written, not how warm any garment is."
    },
    {
      "text": "Position 1's description said the suit \"protects from even the harshest frost\" and quoted a test jury. Its Shopify-generated selling point said the suit was \"proven to keep children warm and dry in extreme winter weather\"; the word \"proven\" does not appear in the description.",
      "source_title": "Cart for Agents: How we checked (winter outerwear data)",
      "source_url": "https://cartforagents.com/guides/winter-clothing-product-data#how-we-checked",
      "source_date": "2026-10-26",
      "method": "observed",
      "limitation": "One record. Shopify may have used merchant data we did not receive."
    },
    {
      "text": "All 10 snowsuit listings offered a size option, labelled in five different ways: month ranges (9-12M), T sizes (2T), year sizes (5Y), \"years\" (1.5 years) and bare numbers (4 to 16). None of the 10 descriptions gave the body height or chest measurement a size is meant for. Position 9's size options ran from 4 to 16, while its Shopify-generated spec list said \"Available sizes: 5-6 years, 7-8 years, 6 US, 16 US\".",
      "source_title": "Cart for Agents: How we checked (winter outerwear data)",
      "source_url": "https://cartforagents.com/guides/winter-clothing-product-data#how-we-checked",
      "source_date": "2026-10-26",
      "method": "observed",
      "limitation": "Description and option fields only. Product pages may carry size charts that the catalog response we received did not include."
    },
    {
      "text": "For the search \"ice cleats for running shoes on icy sidewalks\", the position 4 description said the product \"can be worn in temperatures as low as -41 Fahrenheit\". Its Shopify-generated feature list said \"Suitable for temperatures as low as 41°F\", and its generated spec list said \"Temperature Range: Down to 41°F\". Both generated fields dropped the minus sign.",
      "source_title": "Cart for Agents: How we checked (winter outerwear data)",
      "source_url": "https://cartforagents.com/guides/winter-clothing-product-data#how-we-checked",
      "source_date": "2026-10-26",
      "method": "observed",
      "limitation": "One record, from a traction accessory rather than outerwear. We cannot see how Shopify generated the field."
    },
    {
      "text": "Shopify says some Global Catalog response fields are generated or enriched by Shopify and marked Inferred, including the product description, technical specifications, top features and selling points. It says they may vary in accuracy and should be treated as discovery signals, not merchant-authored source text.",
      "source_title": "Shopify: Global Catalog MCP, Inferred response fields",
      "source_url": "https://shopify.dev/docs/agents/catalog/global-catalog",
      "source_date": "2026-10-27",
      "method": "documented",
      "limitation": "Living developer documentation; the date is when we checked it. It does not say how the fields are generated or how any assistant uses them."
    },
    {
      "text": "Shopify says the Agentic section of the Shopify admin lets merchants review and change how product details are mapped to Shopify Catalog, and preview how products appear in Catalog search.",
      "source_title": "Shopify Help Center: Managing agentic storefronts",
      "source_url": "https://help.shopify.com/en/manual/online-sales-channels/agentic-storefronts/agentic-home",
      "source_date": "2026-10-27",
      "method": "documented",
      "limitation": "Living help page checked on this date. It describes admin tools, not how any assistant ranks or displays a product."
    },
    {
      "text": "OpenAI says ChatGPT's virtual try-on images may not represent the product or the shopper's appearance exactly and do not guarantee fit or size, and tells shoppers to check the merchant's measurements, product details and return policy before buying.",
      "source_title": "OpenAI Help Center: Shopping with ChatGPT Search",
      "source_url": "https://help.openai.com/en/articles/11128490-shopping-with-chatgpt-search",
      "source_date": "2026-10-27",
      "method": "documented",
      "limitation": "Living help article checked on this date; describes one assistant's feature. It does not say how ChatGPT reads size data."
    }
  ],
  "sources": [
    {
      "title": "Cart for Agents: Receipts cited by our guides",
      "url": "https://cartforagents.com/research/agent-shopping-research#receipts-cited-by-our-guides",
      "accessed": "2026-10-27"
    },
    {
      "title": "Shopify: Global Catalog MCP",
      "url": "https://shopify.dev/docs/agents/catalog/global-catalog",
      "accessed": "2026-10-27"
    },
    {
      "title": "Shopify Help Center: Managing agentic storefronts",
      "url": "https://help.shopify.com/en/manual/online-sales-channels/agentic-storefronts/agentic-home",
      "accessed": "2026-10-27"
    },
    {
      "title": "OpenAI Help Center: Shopping with ChatGPT Search",
      "url": "https://help.openai.com/en/articles/11128490-shopping-with-chatgpt-search",
      "accessed": "2026-10-27"
    }
  ],
  "limitations": [
    "The catalog examples come from two searches in Shopify's agent catalog on October 26, 2026, with no shopper context. Six of the ten snowsuit listings came from one seller, so the counts describe that result, not the outerwear category.",
    "We read what was written. We did not test any garment's warmth or fit, and we did not check any rating against manufacturer documentation.",
    "Where a value appears only in Shopify's generated lists, we cannot tell where it came from. It may come from merchant data we did not receive.",
    "The snowsuit ratings were not absent. Two listings stated -30 °C; our own matcher wrongly reported them as missing. That error says nothing about any AI shopping agent.",
    "A temperature rating is a statement under conditions, not a safety guarantee. Nothing here establishes that a child will be warm or safe at any temperature.",
    "The checklist and record template are proposed. No platform requires this format, and we have not measured whether using it changes how assistants choose products."
  ],
  "related": [
    "https://cartforagents.com/guides/spec-sold-product-guides",
    "https://cartforagents.com/research/ai-product-data-unit-normalization",
    "https://cartforagents.com/guides/agent-ready-product-data",
    "https://cartforagents.com/research/agent-shopping-research",
    "https://cartforagents.com/guides/product-specification-template"
  ],
  "published": "2026-10-27",
  "updated": "2026-10-27",
  "checked": "2026-10-27",
  "kind": "guide"
}