Problem scenario
You have tried different anti-fog sprays on sunglasses. Your sunglasses still fog up when you exercise. What should you do?
Solution
Find sunglasses that have a form factor that allows for more air. They do not wrap completely around your eyes, but they will provide protection as sunglasses. With more air to get around the inside of the lenses, they will not fog up as much.
When browsing for the right pair, look at the pictures carefully to find frames that allow for more space between your face and the inside. There can be tradeoffs with protecting your eyes and allowing air in when working out.