Under Armour Armour Ua Strm Vitality Run Vest Running Mens. UA Storm technology is water-repellent and breathable. Durable woven fabric at the front, with stretchy woven fabric on the shoulders and lower back for added mobility and comfort. Strategic 60 g synthetic insulation at the front for moderate warmth without extra weight. Zipped hand pockets that are secure, with an interior pocket for electronic devices. Reflective details for better visibility in low light conditions. Longer cut and rounded shape. Fluorine-free water-repellent treatment.