The last few I’ve bought have been “airport rated”, if that means anything.  I’ve always interpreted that as being a windsock calibrated to fully extend at 15 knots.

But your post got me wondering, and so I looked up FAA requirements.  For those interested, look at https://www.faa.gov/documentLibrary/media/Advisory_Circular/draft-150-5345-27F.pdf

That specifies wind socks, and there’s only two sizes: 18 inches x 8 feet and 36 inches x 12 feet.  Since the sock at Marshall is 24 inches x 8 feet, it’s neither fish nor fowl.

Wind socks are also supposed to withstand 75 knot winds, though it doesn’t specify for how long.

Days and days of 60 knots, though, seems to have deleterious effects, at least on the ones we’ve bought.