Dirt Bandit in CamoDirt Bandits are great for protection against well dust obviously, the sun, the cold, the wind and they look cool. Slides over the head so there's no uncomfortable knot at the back of your neck and is completely reversible Features include: Neck Opening: S M: 15" M L: 18" One side is a tech material for comfort and stability The other side is a brushed rayon poly blend and is perfect for cleaning glasses, your face, your phone, camera lens. whatever