Again, material should pull moisture away from your skin. Warming up and stretching are crucial. You'll be more susceptible to muscle pulls in cold temperatures. When you've finished your run, get warm as quickly as possible and stretch those muscles again. Cover your mouth.
Cold air can aggravate respiratory difficulties.
Try wearing a face mask or a scarf. Drink plenty of fluids. While you may not feel as hot as you do during the summer, you'll still be sweating, and you can get just as dehydrated. Drink water and other nonalcoholic, noncaffeinated fluids even when you don't feel thirsty. By the same token, wear sunscreen .