To use these sunglasses, simply put them on your face like you would with any other pair of sunglasses. They're great for protecting your eyes from the sun when you're out and about, whether you're walking, driving, or at the beach. When it comes to maintenance, use a soft cloth to gently clean the lenses to avoid scratching. Keep them in a case when not in use to prevent damage. And remember, don't expose them to extreme heat or cold, as this could affect the frame and lenses.