I have a bunch of old handkerchiefs that: are soft enough to polish my glasses, thick enough to blow my nose on and come out of the dryer flat enough to just smooth with my hands, fold and put away.  They're just getting frayed around the edges so I'm looking to replace them.

These cotton flannel ones meet all the above criteria... but when I fold them four times so they can fit in a pants pocket (which is were I carry my handkerchiefs) they are way too thick, so I can't use them.  Ironically, I've tried several other brands and they have all been too thin, as well as too stiff and too wrinkly.  So my search continues.

At any rate, these are very nice, soft and well made.