articulated crown

English to German Tech/Engineering Textiles / Clothing / Fashion

This is from a bulleted list of descriptions of a certain type of hat, a type that an adventurer would wear, I guess. Some of the other terms in the list are:
lightweight microfiber poplin construction, elasticized back closure, cape for neck coverage - I get the picture so far - but then "articulated crown", now could this be a special lining at the top, somehow foldable?
Beweglich just does not seem to fit, actually, even after googling I just don't understand what is meant.
Thanks for any suggestions.