Built-in LED lights on brim for the ultimate in low-light running safety. Lightweight, low-profile battery pack tucks into secure side pocket. Unstructured fit conforms to your head for lower profile. Mesh panels add extra ventilation. Graphics and logos provide 360 degree reflectivity for safer low-light runs. Built-in HeatGear sweatband wicks away sweat to keep you cool and dry. Adjustable plastic loop closure in the back. Polyester. Imported. Find the Under Armour Men’s UA Ultrathon Run Cap at Under Armour in the Men,Accessories,Headwear,Cap,Curved Visor Unstructured section.