Mirrored lenses: Reflect light away from your eyes. Mirrored lenses provide a darker view. Suitable for swimming outdoors - especially in bright days swimming. Tinted Lenses: Reduce brightness by creating a darker view during bright indoor and outdoor swimming conditions.- not suitable for bright days or dimly-lit environments. Clear lenses: Offers protection and clear vision without changing the appearance of colors. - Ideal for indoor or low-light swimming situations. Note: this model might be too big for some of the small kids. Please be sure to measure the kid's head before purchase. TIPS for preventing fogging: All of our goggles lenses are covered by a coating. By following these steps you can make the coating last longer: Always remember to rinse the inside lenses so the coating can work. Put goggles in pool water for a while before swimming. NEVER wipe the lenses. After swimming, wash the lenses with fresh water and then leave them to dry.