Black Doo Rag with White Tribal Bandana Headwrap Motorcycle Biker Skull Cap 100% Cotton 100% Cotton Doo Rag Bandana Headwrap and Bumper Sticker by Buy Caps and Hats. Black with white tribal pattern. Flap to protect neck from sun and wind. Lightweight enough to fit under caps and helmets. Ties on back make these caps adjustable to fit many men, women and teens. May not fit larger heads.