To use these sunglasses, simply put them on your face. They're great for protecting your eyes from the sun while you're out and about, like during a walk, a drive, or a beach day. When it comes to maintenance, use a soft cloth to clean the lenses. Avoid using rough materials that might scratch the lenses. Also, don't leave them in a hot car for a long time as it could damage the frames. When you're not using them, store them in the provided case to keep them safe and in good condition.