Mountain Hardware Headwear Size Chart
  Regular Large
Standard Sizing Small Medium Large X-Large
Hat size 7 7⅞ 7⅝ 7⅞
Head Circumference (in) 21" 22¼" 23¾" 25"

These are general guidelines only, sizes are not guaranteed. But no worries, since at SunnySports we offer our exclusive PFF Guaranty