I made "gators" of stretchy windblock fabric and Velco that wrap around my ankle under my tights and go over my boot tops or down to my shoe tops. (I wasn't thinking shoes when I made them or I would have run them longer.) I made them to keep water out of the boots but quickly found myself wearing them on most cold days, wet or dry. They keep my feet a lot warmer. I think not being waterproof helps with foot/sock smell. I'm using the 45North Fasterkatt boots and get regularly surprised how fresh my socks stay, even on days spent indoors wearing the boots.

Ben