Winter Sport Female Athlete: Deena Kastor, 37
A professional marathon runner in Mammoth Lakes, California
Winter skin secret: Opt for a serum. "I run at an altitude of 8,000 feet—it's cold and windy up there! My face gets very dry, so I use a serum with hyaluronic acid to make sure my skin stays hydrated." Keep your skin hydrated with these 3 simple steps.
Must-have winter skin product: Epicuren Discovery Moisture Surge Hyaluronic Acid Gel ($28; epicuren.com)
Winter Sport Female Athlete: Kaya Turski, 22
A free skier for Red Bull in Montreal
Winter skin secret: Go easy on your eyes. "I've noticed the skin around them is thin and delicate and tends to dry out. So I tap on a rich eye cream morning and night—it really helps plump up any little crinkles." More beauty tips: get rid of bags under your eyes.
Must-have winter skin product: Clinique All About Eyes Rich ($29; clinique.com)