BEAMie Hat With Built-In Rechargeable LED Head Lights, Great for Walking at Night, Dog Walking, Running, Auto-Mechanics, Bikers, Camping 35% Acrylic 65% Polyester SUPER POWERFUL: Built-in 4 SMD LED head light, providing 120 Lumens and 4 hours of continuous light! EASY TO USE: Light turns on with the push of a button! Has 3 brightness settings! If you don't want to use the you can simply remove it from the hat for later use! EASY CHARGING: USB charging makes this hat incredibly easy and convenient to charge! Plug into any powered USB port to charge this device. SUPER SOFT HAT: NOW updated with super fine quality and durable fabric materials! The BEAMie beanie cap is made with 35% Acrylic and 65% Polyester ONE SIZE: Fits most teenager and adult head sizes!