The Mizuno Breath Thermo Long Sleeve has you covered in winter weather. Mizuno’s Breath Thermo fabric technology uses escaping body vapor to generate heat that keeps you warm in chilly conditions, and its four-way stretch moves with your body for a tailored fit. With moisture wicking properties and flatlock seams to keep you comfortable, the Mizuno Breath Thermo Long Sleeve is a premium base layer for winter running.