Trev, mousses are a reference to the brand name tied to Michelin Bib Mousse foam inserts. They are used extensively in the isde and offer flat free riding. Drawbacks are that they are heavy, they don't always hold the bread I correctly around the rim, especially near the rim lock if you aren't careful, and when you have to change a tire in four minutes, I sure am not careful. Sometimes they right themselves, but sometimes the don't, and you can get a wobbly feel from the rear end as it bounces up and down. Worse yet, it's the dead feel, and lack of compliance you can get from a tire with air in it. Oh, and lest I forget to mention, you had better use the entire container of lube on each insert before mounting them, or they will disintegrate.
The plus is, they can be changed very quickly because you don't need to add air. More over, you won't get a flat tire.
I hope that clears it up, though I'll bet you were just yanking my chain about not knowing.
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