Full-face helmets offer the most coverage and protection, but can be hot and bulky. Half-face helmets provide less coverage, but allow for better ventilation and visibility. Open-face helmets provide the least coverage but provide a more open and unrestricted feel. 3/4 helmets are a hybrid of full-face and open-face helmets, providing some coverage and protection with a more open feel. Modular helmets offer the convenience of a flip-up visor for easy access to the face, but can be heavier and more expensive. Novelty helmets are designed for show and often lack the safety features of other styles.