Buy Caps and Hats Camouflage Doo-Rags Camo Skull Caps Hunting DU-Bandana Men and Women 100% Cotton Assorted Camouflage Biker Skull Cap Set of 5 and I Love Camo Bumper Sticker by Buy Caps and Hats. Colors include but not limited to: Green, Blue, Gray, Purple and Pink Camo. 100% Cotton. Dries quickly and typically fits under many caps, hats and helmets to absorb moisture and provide comfort. Flap in back to help protect neck from sun, wind and helmet burn. Can be used as a motorcycle or sports helmet or construction hard hat liner to help absorb sweat. One size fits many with ties to adjust to your comfort level.