This will be my first winter in almost 10 year (relaxed and natural) of me leaving the house with my hair completely dry MOST of the time. I use to wash n go almost everyday. I've never had frozen hair, never got the sniffles, rode public transportation etc. The most I wore on my head was earmuffs.Or my scarf to cover my mouth so that I won't breath in other people's viruses.
When I was relaxed, I would just slick it back in a wet bun. Never had ANY issues. That was my method of straightening my hair with no heat. The next day, if my hair was dry I would just bump my ends with a curling iron. Repeat the process every 4-7 days.