@Geoffberner @Larhanya @rchusid @sofiav The rare exception: elastomerics with earloops (like the #breathe1 or #breathe2 or #NanoMask by @prescientx1. The 'elastomeric' aspect keeps the seal excellent despite the earloops.
By the way: if any other #elastomeric-wearing locals would like to experiment with this, I've got plenty of fabric samples either here or coming, all of which are bigger than I really need. I'd be happy to share the bits I don't need (no cost). I think this technique would work with either the Prescientx #breathe2 or the #breathe1, but also the #FloMask (the fabric really is very very thin and is nicely held in place by the mask itself).