{
  "source": "https://mysizecharts.com",
  "license": "Free to use with attribution to SizeCharts.",
  "note": "Conversion tables checked against published international sizing standards.",
  "updated": "2026-07-02",
  "category": "hat",
  "sizes": [
    {
      "circumferenceCm": "53",
      "circumferenceIn": "20 7/8",
      "us": "6 5/8",
      "uk": "6 1/2",
      "eu": "53",
      "letter": "XS"
    },
    {
      "circumferenceCm": "54",
      "circumferenceIn": "21 1/4",
      "us": "6 3/4",
      "uk": "6 5/8",
      "eu": "54",
      "letter": "XS"
    },
    {
      "circumferenceCm": "55",
      "circumferenceIn": "21 5/8",
      "us": "6 7/8",
      "uk": "6 3/4",
      "eu": "55",
      "letter": "S"
    },
    {
      "circumferenceCm": "56",
      "circumferenceIn": "22",
      "us": "7",
      "uk": "6 7/8",
      "eu": "56",
      "letter": "S"
    },
    {
      "circumferenceCm": "57",
      "circumferenceIn": "22 3/8",
      "us": "7 1/8",
      "uk": "7",
      "eu": "57",
      "letter": "M"
    },
    {
      "circumferenceCm": "58",
      "circumferenceIn": "22 3/4",
      "us": "7 1/4",
      "uk": "7 1/8",
      "eu": "58",
      "letter": "M"
    },
    {
      "circumferenceCm": "59",
      "circumferenceIn": "23 1/4",
      "us": "7 3/8",
      "uk": "7 1/4",
      "eu": "59",
      "letter": "L"
    },
    {
      "circumferenceCm": "60",
      "circumferenceIn": "23 5/8",
      "us": "7 1/2",
      "uk": "7 3/8",
      "eu": "60",
      "letter": "L"
    },
    {
      "circumferenceCm": "61",
      "circumferenceIn": "24",
      "us": "7 5/8",
      "uk": "7 1/2",
      "eu": "61",
      "letter": "XL"
    },
    {
      "circumferenceCm": "62",
      "circumferenceIn": "24 3/8",
      "us": "7 3/4",
      "uk": "7 5/8",
      "eu": "62",
      "letter": "XL"
    },
    {
      "circumferenceCm": "63",
      "circumferenceIn": "24 3/4",
      "us": "7 7/8",
      "uk": "7 3/4",
      "eu": "63",
      "letter": "XXL"
    },
    {
      "circumferenceCm": "64",
      "circumferenceIn": "25 1/4",
      "us": "8",
      "uk": "7 7/8",
      "eu": "64",
      "letter": "XXL"
    }
  ]
}