Using your Tifosi Tsali sunglasses is easy. First, adjust the ear and nose pieces to fit your face comfortably. You can swap the lenses according to your needs, like using a darker lens on sunny days and a lighter one in cloudy conditions. When you're done using them, put them in the included case to protect them from scratches. Make sure to keep the lenses clean. You can use a microfiber cloth to gently wipe the lenses. Avoid using harsh chemicals or abrasive materials as they can damage the lenses and the frame. Store your sunglasses in a cool, dry place when not in use to maintain their quality.