Best cap I've found in a long time of looking. Daily wear (coyote brown) for me:
http://www.first-spear.com/product.php?productid=17862&cat=318&page=1
Coming-up on one year of daily wear, and no issues at all.
Cap is breathable, fairly thin material, and so relies on applications of DWR for reasonable water-repellency. It's OK from mfr, but if you see frequent rain, spritz it every so often with DWR. Wash in Woolite so as to retain NVD non-observance, as should be done with all field gear and clothing.
A very nice feature, not mentioned much in the mfr's ad copy, is that the brim of the cap is split, and so makes it very easy to fold up and insert the cap even onto the back pocket of a pair of jeans. That's come in handy many times, as I'm one to take off my hat indoors.
Plenty of fuzzy Velcro for attachment of whatever. NO top button. Cap has a little bit of a peak, and so has a vaguely Germanic/Alpine look. A plus in my book, YMMV.
Individual sizing is done with a metal hook inserted to your choice of sewn-in loops on the back. There is also an elastic end to the adjustment tab, so a
perfect fit can be obtained for almost anyone.
Pay attention to sizing chart. I have no regrets whatsoever, and give it unreserved praise. Money well-spent for me.
Disclaimer: no financial interest.