These are the best earplugs I have ever used, I even bought them for my wife, although I use them myself at work, we often use them in hotel rooms, planes, trains. Very comfortable, they fit perfectly in the ear, the cord and the case are very useful. The filters work very well at work. During concerts or all-night techno parties, at which I often work, I use the strongest ones. Ear plugs, very comfortable, you can work in them for a long time. Alpine rules!