The most effective approach to maintain your goggles fog-free is with anti-fog spray, which is offered by a number of goggle manufacturers. Spray the anti-fog solution into your goggles before each competition or workout, then rinse them. The spray will temporarily support the silicone coating and stop fogging. However, some higher priced devices will come with lenses that have an anti-fog coating, saving you a ton of time and trouble.
Read this article to learn more about what to look out for when buying swimming goggles.