Too many types of tips: one should

For me, the KOSS The Plug headphones is the best: isolation with the outside allows for very nice bass without having to turn up the volume. The foams are soft and endurable for long periods (extended play: careful to preserve your eardrums anyway!). But foams wear out and eventually unpack immediately. They gradually lose their ability to adapt to the ear canal. And overall, they are damaged and dirty.

We must therefore change, and this is the only set of replacement foams. Unfortunately, it satisfies me only half (if not less). It contains three types of foams pairs (type 3 × 2 = 6 pairs = 12 pairs foam):
- The original found on the Koss The Plug headphones
- The same but smaller (apparently for a different type of helmet)
- Flexible plastic end caps with non-return valves.

These are a deplorable comfort. I do not support them more than a quarter of an hour. This is the same system that some earplugs that fit over a kind of lace you put around your neck.

Small caps do not suit me either: their small size does not make a perfect join with the ear canal, so the sound goes outside and feel the bass at low volumes is gone.

So there is that large caps, the same that were originally delivered with the helmet, that give me satisfaction.

Buy this anyway, because the headphone listening quality is really good, and the helmet itself is entirely affordable. But I find it a shame to pay a lot of spare nozzles at high prices and use only one-third ... I find it deplorable that Koss, with a view to a single pack replacement, n ' had not imagined that only one type of nozzle suitable for each client.

Note that the photo of the blue cast product is the old version of the package that contained only foams (I do not know what the sizes), so you will not see the plastic model I'm talking on the picture. The new version of the package is green and white.