This Biker Helmet is a new and unique pet accessory. They are made with the same plastic used in construction hard hat. This lightweight helmets are for dogs and cats who love to travel. Excellent for pet that requires protection from minor head trauma. The Helmet fits up to 10" around the forehead and come in with adjustable chin strap. Fits for small dog breeds like Yorkie, Chihuahua, Maltese, Teacup Poodle and etc.