A large selection of hard hats that come in a variety of styles and models. All hard hats are within compliance of OSHA and safety approved head protection gear. What are hard hats used for? They are used as a rigid protective helmet and worn by factory and building workers and many other professions that need head protection. It is of utmost importance to protect a workers head from injury such as falling objects, impact, debris, wet weather and electrical mishaps. A suspension band inside the hard hat provides protection to the wearer as it helps reduce the blunt force taken to the head by acting as a buffer of 1.2 inches between the shell and skull.