Under Armour Men's ColdGear Infrared Cuff Beanie Body: Acrylic, Lining: Polyester Soft knit fabric provides superior comfort & lightweight performance. Moisture Transport System wicks sweat away from the body. Body: Acrylic. Lining: Polyester. Imported. One size fits all. ColdGear Infrared technology uses a soft, thermo-conductive inner coating to absorb & retain your own body heat.