Craft Active Extreme 2.0 Round Neck Short Sleeve base-layer is made of a thin, lightweight and elastic fabric featuring CoolMax Air, a high-performance fiber that provides superior body-temperature management during intense workouts in mild to cold conditions. Bodymapped mesh panels with big holes ensure superb ventilation while ergonomic 3D design provides a tight, perfect fit. Developed for devoted athletes. Features: A thin, lightweight and elastic base-layer featuring CoolMax Air Strategically placed mesh panels to aid ventilation Stretchy fabric and flatlock seams ensure comfort during exercise Excellent multi-season base layer Winner:ISPO Award