Under Armour ColdGear Infrared Run Lite Running Jacket 100% Nylon Wind Resistant Fabric - A lightweight, translucent nylon woven membrane shields the wearer from inclement weather. ColdGear Infrared Technology - Utilises a soft, thermo-conductive inner coating to absorb and retain body heat. Thumbholes&gt; - Secure sleeves in place and provide additional coverage. Reflective Components - Preserve the wearer's visibility in diminished light. Full Zippered Front - Allows the wearer to manipulate the level of ventilation and/or coverage they receive.