Under Armour Men ColdGear&reg; Run Leggings ColdGear Infrared technology uses a soft, thermo-conductive inner coating to absorb & retain your own body heat. Compression. Dual-layer fabric with an ultra-warm, brushed interior & a slick, fast-drying exterior. Wind- & water-resistant overlays add protection from the elements. 4-way stretch fabrication allows greater mobility in any direction. Performance elastic waistband. Polyester/elastane.