Using your GENTLE MONSTER Her BC1 sunglasses is easy. Just put them on like any other pair of sunglasses to shield your eyes from the sun and look stylish. When it comes to care, don't clean the lenses with rough materials as it can scratch them. Instead, use a soft microfiber cloth. Keep them in a hard - case when not in use to prevent damage. Avoid leaving them in hot places like a closed car as extreme heat can affect the frame and lenses. Regularly check the screws on the hinges to make sure they're tight.