But I also ride with foamies most of the time (laser lites) and airpods occasionally, and I'd guess that the bike and wind are maybe 10-15% louder with airpods. The foamies win out for actually staying in my ears when I put my helmet on, but if I can get it on then the airpods stay in place fine.
Surprisingly, when I was looking for a rough equivalent to NRR for Airpods, I discovered that Apple does advertise their ANC as hearing protection[1], which I'll assume the FDA has now permitted, because Apple didn't used to make that claim because the FDA wouldn't permit it. They don't offer an NRR and they do warn against impulse sounds, but that KB article suggests a 20dB drop, which is nothing compared to foamies but is in the same range as musicians' earplugs or hardhat earmuffs, and probably better than Loops.