As the thread I put up turned down a dark alley, I asked DD’s to ask around their friends what was with the Drynites thing.
Turns out it’s an all-day period thing.
Apparently they don’t leak and feel fresh so if you’re wearing summer stuff like short shorts you’re not going to get blood everywhere and don’t have to worry about changing pad/tampon for much longer.
Who would have thought? DD’s still thought it was odd, but there you go.
Not a fashion thing or kink at all.