I have Etymotic hf5 earbuds and can easily wear them all day. They sound great and are supposed to have 42 dB noise isolation.
Just so that you realize, there is not a chance in the world that this is true.
Clicky
So they're liars eh? Who'd a thought those marketers would do something like that?
I'm still quite happy with the noise isolation they do provide, and have always had a better experience with earbuds, than helmet speakers with or without ear plugs.
Q: How do you know when a marketing person is lying?
A: When his lips are moving.
Their web page actually says: "35-42 dB", but I wouldn't even believe the lower 35 number. It takes a
seriously good earplug to attenuate 33 dB and these can not be equivalent to a seriously good earplug since they have an audio driver and sound port running right through the middle of them. I'm sure they do a good job of attenuating and the acoustic quality is probably excellent, but their specsmanship is sub-par.