Using these YY belay glasses is a breeze. Just put them on like you would with regular glasses, and they'll comfortably rest on your face due to the flexible frame. When you're belaying your partner, the glasses will give you a clear view and keep you safe. As for maintenance, clean the lenses with a soft, dry cloth regularly to keep them clear. Avoid using harsh chemicals or abrasive materials as they can damage the frame or the lenses. When not in use, store them in a protective case to prevent scratches. Also, make sure to check the frame for any signs of wear and tear every once in a while.