During the winter time we will run through our favorite conditioner like we did during the summer time. V05 conditioner is one of my all time fav. drugstore find to keep my strands moist.
Use a heavier, richer moisturiser at least once a week. Slather on the conditioner and wear a plastic shower cap. Clean your house, do some excerise (bascially whatever to stay busy). This will create a humid, moist environment and allow the conditioner to penetrate deeply.
Don't let the cold weather dry out your hair!
You can find this brand at any drugstore or supermarket (I love getting them from the supermarket you can always catch an awesome deal).
Price ranges from $2 - .95