To use these sunglasses, simply put them on your face. When you're not using them, store them in a hard - case to avoid scratches. Clean them with a soft microfiber cloth and a bit of lens cleaner. Don't expose them to extreme heat or cold, as it may damage the frames or lenses. Also, be careful not to bend the frames too much, as they might break. With proper care, these sunglasses will serve you well for a long time.