On the construction site, personal safety equipment is key to keeping yourself out of harm's way. Construction hard hats are essential to protecting you from falling debris or moving objects on the job. Make sure the construction hard hats you wear are best for the task at hand. There are two main types of construction hard hats categorized by type of impact and based on the American National Standard for Head Protection. The first type of construction hard hat is a top impact or Type I hard hat. A top impact construction hard hat helps to protect you from an object that may come from above, directly onto the top of your head. The second type of construction hard hat is a top and lateral impact or Type II hard hat. The top and lateral hard hat does double duty by reducing the impact of an object that may directly hit the top or an off-center part of your head.