I have them and can only use the foamies, roll them up and let them go. You do need to sort of squish them into place, but once in place, locked and loaded. I love the sound, and I probably won't wear them more than an hour or two (I have QCY1s as well). I like the CAs so much I sold my Senn Momentums on ebay (quick sale). Anyway, I may try out the Tranya T1 Pro or the T3, as a second backup pair (to the really cheap QCY 1). But I am keeping the CAs. Just really really like the sound. But for small ear canals, they could be a problem.