After 40 hours of research involving interviews with professional athletes, runners, and fabric specialists, plus tests running in 19 °F weather, we think The North Face Winter Warm Tights are the best men’s winter running tights, and the Sugoi MidZero Tight is the best women’s option. Both feature a brushed interior that’s extremely warm and comfortable, and in our warmth and fit tests they bested all competitors. They’re made from stretchy, durable materials that won’t stink up your closet, and they feature enough pocket space for gels, keys, or other personal items.