Why do my safety goggles keep fogging up?

Moist air will typically condense inside your goggles when they are at a lower temperature. Ventilated safety goggles are the best option to prevent this occurrence and many of the newer goggles on the market have anti-fog coatings already applied. If new goggles aren’t an option, an anti fog coating/spray, Rain X, vinegar, and even your own saliva will also work with most unventilated safety goggles.