I just got an Outdoor Research Sun Runner cap, and while it isn't the height of fashion, their XL actually fits my size 7 3/4 noggin comfortably (even a bit better than the TT XXL, one of the other few melon-sized caps ). While it probably isn't as ventilated as the UA's, it does have side vents. No velcro (and I'm not sure sewing into the nylon-ish material would be a great idea), but no top button, either.
The "removable, adjustable skirt" takes the fashion level down another notch when attached, but would protect necks and ears under direct sun. The whole thing is also UPF 30.
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