OK, so we went out today for about 3 hours today.
I took a pair of these guys to see what they'd be like. Tough to judge a book by it's cover here, because they are simple foam disposables. BUT, they are flagged as 33 db units. I can honestly say I noticed the difference. Hands down they beat my normal orange disposables for quieting noise.
I found them a tad difficult to get into my ears. When compressed they return to their normal state much quicker than my normal orange disposables, so your aim had better be true or you'll end up not getting them seated just right. Other than that, they were super comfortable and still allowed enough high frequency sound through for me to be aware of what was happening around me. They did a great job quieting the dragster we rode by at a local car show where we stopped for lunch, too - man, that thing sounded great!
I can hands down say these will be kept around as my disposable of choice. No idea if they were attenuating at 33db, but I can say they are the quietest disposables I've ever ridden with.