Using these Smith Squad mountain bike goggles is easy. First, adjust the strap to fit your head comfortably. Make sure the goggles sit evenly on your face. When you're riding in different light conditions, swap between the clear lens and the high - contrast ChromaPop lens. The clear lens is great for low - light situations, while the ChromaPop lens gives you a better view in bright light. When it comes to maintenance, use a soft, clean cloth to gently wipe the lenses. Avoid using abrasive materials that could scratch them. After each ride, store the goggles in a protective case to prevent any damage. Also, check the strap regularly for any signs of wear and tear. If you notice the strap is getting loose or damaged, it's time to replace it.