{
  "schema": "scaleandfit.footwear-rings.v1",
  "generatedAt": "2026-11-14",
  "standard": "ISO 9407 Mondopoint / ISO 8653 Ring Sizing",
  "ringFormula": "circumferenceMm = diameterMm * Math.PI",
  "shoeBrands": [
    {
      "slug": "nike",
      "name": "Nike",
      "offsetMm": 0,
      "fitNote": "True to Brannock standard length; medium D width"
    },
    {
      "slug": "adidas",
      "name": "Adidas",
      "offsetMm": 2,
      "fitNote": "Runs slightly long; half UK step tighter than US"
    },
    {
      "slug": "new-balance",
      "name": "New Balance",
      "offsetMm": 0,
      "fitNote": "Consistent anatomical last with wide width options"
    },
    {
      "slug": "hoka",
      "name": "Hoka",
      "offsetMm": -2,
      "fitNote": "Snug midfoot rocker geometry; round up 0.5 size if between sizes"
    },
    {
      "slug": "asics",
      "name": "ASICS",
      "offsetMm": -1,
      "fitNote": "Slightly tapered toe box compared to New Balance"
    },
    {
      "slug": "birkenstock",
      "name": "Birkenstock",
      "offsetMm": 4,
      "fitNote": "Generous contoured cork footbed; size down for narrow fit"
    },
    {
      "slug": "converse",
      "name": "Converse",
      "offsetMm": 5,
      "fitNote": "Runs 0.5 size large; most buyers size down half a US size"
    },
    {
      "slug": "vans",
      "name": "Vans",
      "offsetMm": 1,
      "fitNote": "Classic vulcanized canvas fit; true to length"
    },
    {
      "slug": "salomon",
      "name": "Salomon",
      "offsetMm": -2,
      "fitNote": "Precision athletic trail wrap; snug heel lock"
    },
    {
      "slug": "on-running",
      "name": "On Running",
      "offsetMm": -1,
      "fitNote": "Swiss CloudTec last runs slightly compact"
    },
    {
      "slug": "dr-martens",
      "name": "Dr. Martens",
      "offsetMm": 3,
      "fitNote": "Structured leather boot last with generous toe room"
    },
    {
      "slug": "crocs",
      "name": "Crocs",
      "offsetMm": 4,
      "fitNote": "Relaxed roomy resin fit; whole sizes only"
    },
    {
      "fitNote": "Standard fit",
      "name": "Brooks",
      "offsetMm": 0,
      "slug": "brooks"
    },
    {
      "fitNote": "Standard fit",
      "name": "Saucony",
      "offsetMm": 0,
      "slug": "saucony"
    },
    {
      "fitNote": "Standard fit",
      "name": "Puma",
      "offsetMm": 0,
      "slug": "puma"
    },
    {
      "fitNote": "Standard fit",
      "name": "Reebok",
      "offsetMm": 0,
      "slug": "reebok"
    },
    {
      "fitNote": "Slightly narrower",
      "name": "Mizuno",
      "offsetMm": -1,
      "slug": "mizuno"
    },
    {
      "fitNote": "Standard fit",
      "name": "Merrell",
      "offsetMm": 0,
      "slug": "merrell"
    },
    {
      "fitNote": "Slightly longer",
      "name": "Timberland",
      "offsetMm": 3,
      "slug": "timberland"
    },
    {
      "fitNote": "Standard fit",
      "name": "Clarks",
      "offsetMm": 0,
      "slug": "clarks"
    },
    {
      "fitNote": "Standard fit",
      "name": "Allbirds",
      "offsetMm": 0,
      "slug": "allbirds"
    },
    {
      "fitNote": "Standard fit",
      "name": "Veja",
      "offsetMm": 0,
      "slug": "veja"
    },
    {
      "fitNote": "Standard fit",
      "name": "Keen",
      "offsetMm": 0,
      "slug": "keen"
    },
    {
      "fitNote": "Standard fit",
      "name": "Under Armour",
      "offsetMm": 0,
      "slug": "under-armour"
    },
    {
      "fitNote": "Heritage low-profile Japanese trainer; slightly snug length",
      "name": "Onitsuka Tiger",
      "offsetMm": -2,
      "slug": "onitsuka-tiger"
    },
    {
      "fitNote": "FootShape wide anatomical toe box with true length",
      "name": "Altra",
      "offsetMm": 1,
      "slug": "altra"
    },
    {
      "fitNote": "Roomy forefoot with locked midfoot heel pocket",
      "name": "Topo Athletic",
      "offsetMm": 1,
      "slug": "topo-athletic"
    },
    {
      "fitNote": "Technical Italian mountain last runs half-size compact",
      "name": "La Sportiva",
      "offsetMm": -3,
      "slug": "la-sportiva"
    },
    {
      "fitNote": "Precision European approach fit; slightly firm toe rand",
      "name": "Scarpa",
      "offsetMm": -2,
      "slug": "scarpa"
    },
    {
      "fitNote": "Standard German trekking last built for hiking socks",
      "name": "Lowa",
      "offsetMm": 0,
      "slug": "lowa"
    },
    {
      "fitNote": "Generous Alpine Comfort Fit forefoot width",
      "name": "Meindl",
      "offsetMm": 1,
      "slug": "meindl"
    },
    {
      "fitNote": "Danish comfort anatomical last with extra forefoot volume",
      "name": "ECCO",
      "offsetMm": 2,
      "slug": "ecco"
    },
    {
      "fitNote": "Italian European last slightly generous in casual styles",
      "name": "Geox",
      "offsetMm": 1,
      "slug": "geox"
    },
    {
      "fitNote": "Minimalist EU sizing; round toe box accommodates medium width",
      "name": "Camper",
      "offsetMm": 1,
      "slug": "camper"
    },
    {
      "fitNote": "Heritage work boots typically sized half to one US size down",
      "name": "Red Wing",
      "offsetMm": 5,
      "slug": "red-wing"
    },
    {
      "fitNote": "Australian Chelsea boot AU sizing; half sizes add width only",
      "name": "Blundstone",
      "offsetMm": 2,
      "slug": "blundstone"
    },
    {
      "fitNote": "Shearling fleece compresses over wear; snug initial fit advised",
      "name": "UGG",
      "offsetMm": 3,
      "slug": "ugg"
    },
    {
      "fitNote": "Standard international court trainer sizing",
      "name": "FILA",
      "offsetMm": 0,
      "slug": "fila"
    },
    {
      "fitNote": "Classic Italian court and heritage running last",
      "name": "Diadora",
      "offsetMm": 1,
      "slug": "diadora"
    },
    {
      "fitNote": "Relaxed Fit casual last gives comfortable forefoot depth",
      "name": "Skechers",
      "offsetMm": 2,
      "slug": "skechers"
    },
    {
      "fitNote": "Hybrid dress-sneaker last often runs half size generous",
      "name": "Cole Haan",
      "offsetMm": 2,
      "slug": "cole-haan"
    },
    {
      "fitNote": "Classic European handball & retro sneaker proportions",
      "name": "Hummel",
      "offsetMm": 0,
      "slug": "hummel"
    },
    {
      "fitNote": "Slim tapered canvas sneaker; consider up 0.5 for wide feet",
      "name": "Keds",
      "offsetMm": -1,
      "slug": "keds"
    },
    {
      "fitNote": "Finnish heritage running shoes run slightly short; size up 0.5",
      "name": "Karhu",
      "offsetMm": -2,
      "slug": "karhu"
    },
    {
      "fitNote": "Whole-size adjustable strapping sandals; true standard length",
      "name": "Teva",
      "offsetMm": 1,
      "slug": "teva"
    }
  ]
}