{
  "id": "N01-WIN",
  "url": "https://cartforagents.com/guides/winter-outerwear-field-guide",
  "title": "Winter outerwear field guide: check warmth, fit and waterproofing before you recommend a coat",
  "description": "What a shopping assistant or careful shopper should check before recommending a winter coat or snowsuit: the signed temperature rating and what it covers, body measurements, waterproofing, and when to say \"not enough information\".",
  "answer": "Before recommending winter outerwear, ask what the shopper will be doing, for how long, in what cold, and over what layers. Then accept only a temperature rating that keeps its minus sign and says what it covers and under what conditions, plus body measurements for the size. If no listing supports a must-have, say none fit; if the listing doesn't say, say you can't tell and ask.",
  "take": "Most winter coats never state a temperature at all, and the ones that do can lose the minus sign or the word \"hood\" on the way to an AI assistant. Treat a missing rating as unknown, never as warm enough.",
  "summary": "A checklist for anyone recommending a winter coat or snowsuit, human or AI. Ask about the day the coat has to survive, read every temperature rating like a sentence, and say \"I can't tell\" when the listing doesn't say. With real examples from Shopify's catalog, including a rating that lost its minus signs.",
  "claims": [
    {
      "text": "For the search \"kids snowsuit warm for minus 20\", the listing in 3rd place said in its description that the insulation \"is designed for approximately 35°F to -5°F (0°C to -20°C), depending on activity level and layering\". Shopify's generated spec list for the same record said \"Insulation: Rated for 0°C to 20°C (35°F to 5°F)\", and a generated feature line said \"Warm insulation rated for 0°C to 20°C\".",
      "source_title": "Cart for Agents: Winter outerwear field guide, How we checked",
      "source_url": "https://cartforagents.com/guides/winter-outerwear-field-guide#how-we-checked",
      "source_date": "2026-11-04",
      "method": "observed",
      "limitation": "One unpersonalized Shopify Catalog search. We can't see how Shopify generated the field, or whether any assistant used it."
    },
    {
      "text": "For the search \"toddler snowsuit rated for minus 30\", the listing in 9th place rated the hood's insulation to -30°C in its description (\"a hood with insulation rated to -30°C\"). Shopify's generated spec list said \"Insulation: rated to -30°C\", without the word hood. The listing in 2nd place had \"protects to -30 °C\" in its title; its description said \"Temperatures ca. 0 - -30 °C\" and, beside a list of activities, \"around -10°C to -30°C\".",
      "source_title": "Cart for Agents: Winter clothing product data",
      "source_url": "https://cartforagents.com/guides/winter-clothing-product-data",
      "source_date": "2026-10-26",
      "method": "observed",
      "limitation": "One saved catalog snapshot. Quotes what the records said, not how warm either suit is."
    },
    {
      "text": "In the Nov 4 \"kids snowsuit warm for minus 20\" search, the listings in 7th and 10th place each described \"a hood with insulation rated to -30°C\", while their generated spec lines read \"Insulation Rating: -30°C\" and \"Insulation: rated to -30°C\".",
      "source_title": "Cart for Agents: Winter outerwear field guide, How we checked",
      "source_url": "https://cartforagents.com/guides/winter-outerwear-field-guide#how-we-checked",
      "source_date": "2026-11-04",
      "method": "observed",
      "limitation": "Positions 7 and 10 of one search, from the same seller. A pattern worth checking, not a measured rate."
    },
    {
      "text": "For the search \"womens winter parka rated to minus 30\", none of the 10 titles or descriptions stated a temperature rating. Shopify's generated spec lists for 5 of the 10 gave a down fill power between 550 and 800, and two generated care lines said \"Machine wash at 30°C\". For \"mens winter jacket warm enough for minus 25 waiting for the bus\", none of the 10 titles or descriptions gave a temperature figure.",
      "source_title": "Cart for Agents: Winter outerwear field guide, How we checked",
      "source_url": "https://cartforagents.com/guides/winter-outerwear-field-guide#how-we-checked",
      "source_date": "2026-11-04",
      "method": "observed",
      "limitation": "Two searches, top 10 each, no shopper location. Counts what was written, not how warm any coat is."
    },
    {
      "text": "In the parka search, Shopify's generated spec list for the listing in 7th place said \"Water Repellency: TEI 3 (rated for 10°C to 20°C)\". Neither \"TEI\" nor any temperature appeared in the description we received.",
      "source_title": "Cart for Agents: Winter outerwear field guide, How we checked",
      "source_url": "https://cartforagents.com/guides/winter-outerwear-field-guide#how-we-checked",
      "source_date": "2026-11-04",
      "method": "observed",
      "limitation": "We can't see Shopify's inputs; the value may come from data we didn't receive."
    },
    {
      "text": "The parka in 4th place gave bust, waist and hip measurements plus coat length for each size in its description, told shoppers to compare body measurements with the chart, said ease for insulation and layering is built in, and advised choosing the larger size when between sizes.",
      "source_title": "Cart for Agents: Winter outerwear field guide, How we checked",
      "source_url": "https://cartforagents.com/guides/winter-outerwear-field-guide#how-we-checked",
      "source_date": "2026-11-04",
      "method": "observed",
      "limitation": "Quotes the listing; we didn't check the chart against a garment."
    },
    {
      "text": "The kids' snowsuit in 3rd place stated a water column over 12,000 mm and said its seam waterproofness is rated 1 out of 2 rather than fully seam-sealed.",
      "source_title": "Cart for Agents: Winter outerwear field guide, How we checked",
      "source_url": "https://cartforagents.com/guides/winter-outerwear-field-guide#how-we-checked",
      "source_date": "2026-11-04",
      "method": "observed",
      "limitation": "Quotes the listing's description; we didn't test the fabric."
    },
    {
      "text": "Shopify marks some Global Catalog fields as Inferred, generated or enriched by Shopify, including the description, options, technical specifications, top features and unique selling points. It says they may not always be present, may vary in accuracy, and should be treated as discovery signals rather than 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": "2026-11-04",
      "method": "documented",
      "limitation": "Living developer documentation. It doesn't say which values were generated for a given product."
    },
    {
      "text": "OpenAI says ChatGPT's virtual try-on images 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": "2026-11-04",
      "method": "documented",
      "limitation": "Living help page about one assistant's try-on feature."
    }
  ],
  "sources": [
    {
      "title": "Shopify: Global Catalog MCP",
      "url": "https://shopify.dev/docs/agents/catalog/global-catalog",
      "accessed": "2026-11-04"
    },
    {
      "title": "OpenAI Help Center: Shopping with ChatGPT Search",
      "url": "https://help.openai.com/en/articles/11128490-shopping-with-chatgpt-search",
      "accessed": "2026-11-04"
    },
    {
      "title": "Cart for Agents: Winter clothing product data",
      "url": "https://cartforagents.com/guides/winter-clothing-product-data",
      "accessed": "2026-11-04"
    }
  ],
  "limitations": [
    "This checklist recommends no product or brand, and it isn't a safety standard. No temperature rating, ours or anyone's, guarantees a person stays warm.",
    "We haven't tested whether shopping assistants that follow this checklist give better answers.",
    "The examples come from Shopify Catalog searches on October 26 and November 4, 2026, top 10 results, with no shopper location set. A search today could look different, and other assistants get product data in other ways.",
    "We wrote the searches to sound like shoppers. Store and brand names are withheld.",
    "The worked example near the end uses invented listings."
  ],
  "related": [
    "https://cartforagents.com/guides/winter-clothing-product-data",
    "https://cartforagents.com/guides/spec-sold-product-guides",
    "https://cartforagents.com/guides/product-claim-provenance",
    "https://cartforagents.com/guides/size-chart-accessibility",
    "https://cartforagents.com/guides/negative-product-attributes",
    "https://cartforagents.com/research/ai-product-data-unit-normalization",
    "https://cartforagents.com/guides/humidifier-field-guide",
    "https://cartforagents.com/guides/travel-bag-field-guide"
  ],
  "published": "2026-11-04",
  "updated": "2026-11-04",
  "checked": "2026-11-04",
  "kind": "field-guide"
}