Brooks Running Reflective LED NightLife Hat. The Nightlife reflective hat is updated with even more retro-reflectivity, a perforated bill and a flat LED light to keep you visible in any situation. Its removable battery pack -- which uses one CR2032 Lithium 3V battery -- makes it easy to replace batteries and wash your hat, while also doubling as a portable pen light.
Fabric: 100% Polyester
To change the battery in the NightLife hat, or remove it for washing: