Using these Izipizi junior sunglasses is easy. Just put them on your child's face like regular sunglasses. When it comes to cleaning, use a soft, clean cloth to wipe the lenses gently. Avoid using rough materials that could scratch the lenses. Also, make sure to store the sunglasses in a case when not in use to prevent damage. Keep them away from extreme heat or cold as it might affect the quality of the lenses and the frame. And remember, these sunglasses are designed for kids aged 5 - 10, so ensure they fit properly on your child's face for maximum comfort and protection.