What characteristic must proper eye and face protection have regarding fit?

Proper eye and face protection must fit snugly and not interfere with movement to ensure maximum safety and effectiveness. This snug fit is critical because it prevents hazardous materials such as dust, chemicals, or flying debris from entering around the edges of the protective equipment. A snug fit also helps to ensure that the protective equipment remains in place during movement and reduces the risk of distraction or discomfort that might occur with looser fitting gear.

While comfort is important, it should not compromise safety. The equipment needs to securely cover and protect the eyes and face without hindering visibility or freedom of movement, which is essential in many work scenarios, especially in construction where hazards are prevalent.

Adjustability for different head sizes, lightweight materials, and ease of removal are considerations for comfort and versatility but do not replace the primary need for a secure and effective fit during operation.