I have had better sealing with my Shure SE425 (I think that's right) than I do with my Encore U's now. I keep changing tips and have found a better seal but could really do with some good ones. I do not like the foam type, nor the multi-lip type. I need large tips for my bucket ear canals, pfft. I often think I should have gone the custom route but I didn't so tough on me. LOL. Being honest with myself, the not-so-good thing I did was buy the Toxic SW24 cable. It's a pain behind my ears for longer listening as it's thick, but I wanted TRRS at that time for my ZX2 also.