Ditto on the 7-3/4" head for me...and I can comfortably wear one.

The reason I choose Headsweats is they give a deal for the Janus Charity Challenge so that more profits can go to the beneficiary. Headsweats also makes a khaki and olive "all terrain" cap that are more subdued... but not quite as comfortable.
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"Trust in God --and press-check. You cannot ignore danger and call it faith." -Duke