Military Hat Size Chart
  X-Small Small Medium Large X-Large
Hat Size: 6 1/2 to 6 3/4" 6 7/8 to 7 7 1/8 to 7 1/4 7 3/8 to 7 1/2 7 5/8 to 7 3/4
Head Size: 20 1/2 to 21 1/8 21 1/2 to 21 7/8 22 1/4 to 22 5/8 23 to 23 1/2 24 to 24 3/8
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