^
Good example- the top stainless wire loop is intended for the fabric to rubs against, presenting a smooth "less scratchy" surface.
I use the older non-heavy-duty DPA 406x concealers which are a similar single plastic part without the wire bits, and the clear plastic cover serves the same purpose. The wire loop probably works better, by providing a bit of air space between the surface and mic element and making it less likely fabric will contact the mic grid mesh.
DPA's hard-rubber boundary mount adapters for these mics work well too, making for a very flat and smooth surface under fabric. Would be good to incorporate such a wire loop into those as well, but they aren't actually intended for use under fabric.