Black, 100% cotton ball cap. This hat is amazing! It has independent under-the-brim switches for White and Red LED Lighting options along with independent battery packs. It'll keep you cool during the day, and illuminated at night. Button-less design is comfortable, even while wearing a headset!6 LED design for task and distance lighting2 red LEDs under brim for task lighting/preserve night vision, 12 lumens, 13 meters light field2 white LEDs under brim for task lighting - 24 lumens, 13 meters light field2 LEDs in the brim for distance and overhead lighting, 21 lumens, 22 meters light field68 hours run timeSeparate switches and battery packs for red and white and red lighting optionsT