Ultrafun Hands Free Baseball Cap with 5 Bright LED Lights, Ultra Bright Led Light Power Cap Hat for Outdoor Running Fishing Camping Hiking and More FUNCTIONAL: 100% cotton, experience predawn and nighttime activities much more clearly. One Size Fits Most: adjustable velcro back strap. Easy to use: One-click power button for easy on/off operation. Batteries: Powerful batteries INCLUDED, provide up to 72 hours of life and are easily replaced with your own standard button cell CR2032. BEST VALUE: Matching almost any other color of shirt or jacket in your closet. Easy to use anywhere, anytime and in any condition, including wet weather or low temperatures, it lights the way!