Purchase on Final Sale from Nepenthes NY but it doesn't fit me. Circumference around the inside is 24.25 inches around, so 7 1/2 or above, I'd say. But of course, measuring your own head or checking a well fitting hat you own is best. 100% wool, made in the USA, from the AW15 season. The cost listed above includes shipping in the continental U.S. If you live outside this boundary, please message me for an updated quote.