Is there a reason surf bikini brands (ala Roxy) have such low rise bottoms?Is there a function or reason for it when surfing or is it purely a style thing?

Its mainly just style but is also helps with air resistance.

It is for style.

l wish they actually had shorts that were a bit higher.

aesthetics most likely, but also the feeling of being less constricted

Style for sure. Low rise are not practical for duck diving or surfing in general.

So its not as fuqin uncorfatable plus its looks dope. Hey Im not coplaning they look mad hot =)