I was able to fit my old Jabra Eargel over top of the Jawbone’s black rubber earbud, and it fits perfectly. Now I don’t need to use a loop around my ear, which is so much better especially with glasses.
(In case you’re wondering why the Eargel is green, they came in a Telus promo with my first Jabra wired headset, ages ago. They were green for large, fuschia for medium, and I can’t remember the other colour now.)27 Jan