Those don't sound like a good fit for motorcycles - from what I read, they are for construction workers, etc where they are exposed to short burst of loud noises - kind of like automatic welder's goggles for your ears. I that situation, regular plugs are never in when you need them, so I think the idea is to leave these in all the time and they will protect your ears if and when required.
I guess they might be useful for riding around town where you want to hear at low speeds but get the noise cut at higher speeds.
They are also $$$$$ - almost as much as Shure 535's!
2006 FJR1300A, 2005 GS1150 Adventure, 2002 DR650 SE, a fortune in Farkles.
"No matter how many [internet] opinions you line up, you can't vote nonsense into truth"- Kevin Cameron