I bought a pair of brand new Red Wing shoes(the best made in USA ones) in October. I have never had problems with smelly shoes, now matter what I have worn or how long I have kept them (and some of my boots over the years have reached voting age) For some reason that is a mystery to me, a couple of months ago, this pair of shoes suddenly began to emit this musty odor. Almost like the odor of a stinkbug. both shoes. they've never been wet, not even damp (I have reserved my other already beat up shoes for such situations) Have tried airing them in the sun and etc., but it persists. Ideas, suggestions?