We all know that you can't "catch a cold from being cold," but feeling cold will affect your immune system, making it less able to protect itself from germs.
So whenever you're going to be in cold weather - make sure you're dressed right with long underwear, a warm coat, a hat, and mittens.
Check out these down mittens from Sierra Designs. They come in 6 different colors, and are filled with toasty warm insulating down. And for $25, they'll keep your fingers warm whether you're out snowshoeing or running to get the mail.
If you love those, you'll love these down slippers. Great for keeping your tootsies warm when hanging out at home.