Under Armour Men's Ua Storm ColdGear Infrared Hybrid Jacket 100% Nylon Imported Machine Wash Front body uses 100 g PrimaLoft insulation - This is light, breathable and can be compressed without losing warmth. ColdGear Infrared technology - Uses a soft, thermo-conductive inner coating to absorb and retain your own body heat. Dual-layer fabric - With an incredibly warm, brushed interior and a slick, fast-drying exterior. 4-way stretch fabrication - Allows greater mobility in any direction. Moisture Transport System - Wicks sweat away from the body.