Well, I rolled the dice on a few of these and have to say, I'm pleasantly surprised. The supplier advertised these just as accurately as they could. Apparently these are made "by a government contractor" out of "military material".
Basically I don't know if these are surplus or if they're an identical product made recently by the same manufacturers who made them during Vietnam, or hell, they could actually be surplus. They have a 1971 manufacture code on the tags...
Anyway, what I can tell you is that they are indeed Brown-Dominant ERDL pattern boonies with a 3" brim made out of 100% cotton rip-stop, and are IDENTICAL to originals I've seen. This is a "Gen II" Hat with the wider brim to allow for more rain to be guided away from the head while wearing. The camo band is nylon just like the earlier boonies.
Whether these are "surplus" or not, they're made 100% like the originals and are great for everyday wear or for reenacting late Vietnam or 70s/80s US troops.
These are sized like real boonies in that they are about 1 size bigger than what the tag says to allow for shrinkage and air flow while wearing. That being said, these won't fly away they're so big, they just fit more loose than a patrol cap.