Using these Izipizi sunglasses is super easy. Just put them on your child's face and adjust the silicone strap if needed to make sure they fit comfortably. When it comes to safety, keep in mind that these are for kids aged 3 - 5 years, so always supervise your child when they're wearing them. To maintain the sunglasses, clean the lenses with a soft, dry cloth regularly. Avoid using harsh chemicals as they might damage the polarized coating. Store them in a protective case when not in use to prevent scratches and keep them in good condition for a long time.