This is the one layer you don't have to keep taking off and putting on all day. That's because it actually adapts to the temperature, keeping you warm when it's cool, but letting out extra heat as the day gets going. "UA Storm technology repels water without sacrificing breathability Breathable insulation paired with lightweight, smooth spacer fabric for just the right amount of warmth Generous ½ zip front makes for easy layering Style #: 1366280 Reflective details Upper front/lower back: 91% Polyester/9% Elastane Lower front/upper back/sleeves: 88% Polyester/12% Elastane Imported Garment should be washed & dried zipped up Wash garment inside out Machine wash cold with like colors Use only non-chlorine bleach when needed Tumble dry low Do not iron Do not use softeners Do not dry clean"