I might do a test of this, as the heat might melt the plastic? Probably not, though.
I really don't know if you will need the plastic, but when it's cold enough for the chemical warmers, I have booties on.
Make sure you open the warmers' package 5 minutes or so before you put them in your shoes. They really work better when they have this time to activate.



It will be close to freezing however and I don't have winter cycling boots/shoes.
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