Ultimate Ears has launched the UE Fits, a set of true wireless earbuds that promise the "perfect fit." The new buds use a polymer that it calls Lightform to mold to the unique shape of a user's ears in under 60 seconds.
https://www.notebookcheck.net/Ultimate-Ears-UE-Fits-TWS-earbuds-promise-users-the-perfect-fit-using-unique-Lightform-technology.496658.0.html