I lost my beloved etymotic 4s on the plane. Maybe I should buy them again. These sealed isolation things are great but in buying $40-150 ones I've found the biggest variable is a good seal: 1. Brookstone Pro Plug.$40 so inexpensive. Fit is not really sealed bit they r just so bassy. Not recommended.

2. Nuforce 8. $70. Supposed to be amazing. I tried with the stock earplugs and can't get a good seal. Recommendation is to buy a$15 set of super pro plugs. Ill try that but that puts it a pretty high price point like the Etymotic 6i. They r more balanced than the Brookstone. So not recommended with stock plugs. Will see with the add-one.

3. Shure Se-210. Widely distributed. Sound ok and better fit than Nuforce. At $120 I wouldn't say they r much better than the$90 etymotic 6i

4. Etymotic 4s. Although only a single driver the main thing is that they really fit well. Thy have foam plugs that r as tight as soundplugs. Sounds is remarkable at \$180