Shure Olive tips are what I use, it takes a bit of work to get them on but the fit & seal are well worth the effort. Unfortunately though after a couple of years (I pre-ordered them when they first came out) my triple.fi 10's dying on me. They both have broken wires internally and I have to fiddle with them to get them to work... I just wish I had known about the Amazon sale before they were gone.
Gary