100% Polyester. Brushed microfleece fabric is soft on both sides & delivers superior warmth. ColdGear Infrared technology uses a soft, thermo-conductive coating to absorb & retain your bodyheat. Armour Fleece panel at back yoke, pocket welts and center front placket. Generous 1/2 zip front makes for easy layering. Dropped, shaped hem for enhanced coverage. UA logo at left sleeve