Using your Tifosi Davos sunglasses is a breeze. First, adjust the ear and nose pieces to fit your face comfortably. When you're out in the sun, put them on just like any regular pair of sunglasses. Make sure they sit firmly on your nose and ears so they don't slip during your activities. As for care, keep them in the included case when not in use to protect them from scratches. Clean the lenses with a soft, lint - free cloth. Avoid using harsh chemicals or abrasive materials as they can damage the frame and lenses. And remember, although they're durable, don't subject them to extreme forces or temperatures to ensure they last a long time.