Take comfort in a warm run with heat -generating Breath Thermo® fabric where you need it, 360 reflectivity and a side zipper pocket for all your needs. 360 Reflectivity 4-Way Stretch Material: Moves with your body for a tailored fit. Flatlock seaming Moisture wicking BREATH THERMO®: Mizuno's exclusive thermal fabric technology that uses escaping body vapor to generate heat. Wide waistband