I am saddened to find that these are no longer available since the Silencio buyout. I have sensitive ear canals and every other plug I have tried causes discomfort in minutes to an hour. I can wear these for several hours. It takes some experience to learn the best shape to roll them to before insertion, but once you get it they work extremely well. I am now left with no good altenative. They last so long that I didn't know they were discontiued until the pipeline was dry. I read a review speculating on the purpose of the "tubes" on the ends, they must not use plugs much. Those are for you to insert a cord if you desire.
Pros: Takes getting used to inserting them perfectly
This review was written in the old system and had content requirements that are different than reviews written today.