Face shields and headgear protect workers from falling objects, flying debris and chemical splashes. Face shields come in full-face and half-face forms. Full face shields are used in more hazardous applications, while half face shields are used to protect workers' eyes. Face shields are held in place by headgear, which can be worn alone on workers' heads or adapted to hard hats. Hard hats cover the entire head and offer full protection against impact. They typically have thick brims that provide some sun protection and allow cap adapters to attach headgear and face shields.