Originally Posted by Texcollect
The secret it to get a complete seal in the ear canal. If you can accomplish that then to a certain extent ALL in ear earphones are noise isolating, just not noise cancelling. The M6 is a great isolating plug if you get the right tip on it. I use the triple flange ones and they work great.
Agreed. The problem I find is that they may seal temporarily. Nothing has retained that seal like the ERs.