Hair care in the cold season
Dry indoor air, a hat and hot water together do more damage than the frost. A few small changes change the outcome.
In winter hair becomes harder to manage, and the main culprit is not the cold outside but the repeated move between dry indoor air and the temperature outdoors. Low humidity pulls water out of the strand, and friction against fabrics does the rest.
Hot water
A very hot shower strips the lipid layer that keeps water inside the strand. Lukewarm water cleans just as well and leaves hair visibly less dry. It is the cheapest change on this list.
Hats and static
Synthetic fabrics charge the strand with static. A cotton or silk lining reduces the effect, as does a mask once a week, which smooths the cuticle and lowers friction.
Drying
Wet hair is at its most fragile. Do not rub it with a towel and do not step out into freezing air with it wet, because the water inside the strand freezes and breaks it. Blot it, let it dry partly, then use warm air rather than hot.
None of these changes is dramatic on its own. Together they are the difference between hair that looks well in January and hair that is only waiting for spring.