I have posted last year sometime in another thread about this

Probably because i am a scrooge, and in NZ we also have this mentality that we can come up with solutions on our own, I have resisted all ways of keeping my feet warm (such as neaoprene booties) and still use plastic bages.

I cut the corners off the ends of bags, slip them over my toes (no bag is visible outside of the shoe) and I find the plastic reduces the wind chill 100% and my toes do not freeze. i do not have to resort to thick uncomfy woollen socks or spend money I am reluctant to anyways...

However, that being said, it snows about once every seven years where I live, and I have never biked in snow or sleet... maybe then I would be getting both neoprene and wool!