These open-ear buds actually have decent noise reduction

"My biggest gripe about open-ear buds is that they're rotten for loud city commutes. Cue a pedantic audiophile pointing out that the whole premise of open-ear buds is to not block out sound. Yes, yes. But the unfortunate truth is that often means if you want open-ear buds for one situation, you'll have to buy a second pair for when the train is screeching along the subway tracks while the local mariachi band starts busking in your car."

"Technically, the correct term is noise reduction. Active noise cancellation requires a sealed ear canal, whereas the OpenFit Pro don't do that. Instead, the buds have a triple microphone array, a tweaked speaker design, and an adaptive algorithm to dampen unwanted environmental noise. Two of the microphones monitor environmental sounds, while a third microphone next to your ear tracks what's reaching the canal."

Open-ear earbuds often perform poorly on loud city commutes, forcing users to carry a second pair for noisy environments. Shokz's OpenFit Pro, priced at $249.95, aims to reduce environmental noise through noise reduction rather than true active noise cancellation. The design pairs a tweaked speaker with a triple-microphone array and an adaptive algorithm to dampen unwanted sounds. Two microphones monitor external noise while a third near the ear measures what reaches the canal. The OpenFit Pro's approach provides meaningful noise reduction for commuters but does not substitute for sealed ANC earbuds.

Read at The Verge