Using these Izipizi sunglasses is 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 maintenance, use a soft cloth to gently clean the lenses. Avoid using harsh chemicals as they might damage the polarized coating. Also, store the sunglasses in a protective case when not in use to prevent scratches. Be careful not to bend the frames too much, as although they are flexible, excessive force can still cause damage. Make sure to check the fit regularly as your child grows.