How do people still not know about this!?!
AverySound.com provides custom earpieces for professional and personal applications including cell phones, iPods, Bluetooth earsets, radios, and headsets as well as various levels of hearing protection.
www.averysound.com
I have a shallow impression for my Sennheiser phone earpiece, and deep impressions for my WF-10004. On a plane with the ANC on, the engine noise is gone. And the WF-10004 has an ambient voice mode, so switching between media and talking to a stewardess is seamless
Absolutely the best user experience for any earbud, period. Not cheap, but it's the only real answer to the universal-fit problem.
DM me if you are interested in photos.