Under Armour Men's ColdGear Armour Elements Mock 100% Other Fibers Imported UA Storm technology on arms & shoulders repels water without sacrificing breathability ColdGear Infrared technology uses a soft, thermo-conductive inner coating to absorb & retain your own body heat Dual-layer fabric with an ultra-warm, brushed interior & a smooth, fast-drying exterior Mesh underarm panels deliver strategic ventilation 4-way stretch construction moves better in every direction