Helmet laws vary from state to state in the US. All riders are expected to wear a helmet, but there can be differences in what kind. In some states, motorcyclists must wear a Department of Transportation (DOT) approved helmet. This means that it meets specific safety standards set by the National Highway Traffic Safety Administration (NHTSA). In other states, riders may have more freedom when it comes to helmet choice. They may be able to wear any type of helmet they choose as long as it has a chin strap and is securely fastened under their chin. Some states even allow for partial-face helmets or novelty helmets with no DOT approval. It's important for riders to check their local laws before hitting the road. Not only will this help keep them safe, but it'll save them from potential fines or tickets if they're caught not wearing an approved helmet.