Noise cancelling technology have been used for headphones, Bluetooth speakers so far.
It doesn’t physically block the noise, instead the it actively cancels out the noise by generating the sound waves which is inverse to the on-coming sound.
Noise cancelling earplugs work just like noise cancelling earbuds (Bose QC20, Sony WF-1000MX3) but they can not be used for listening to music.
Not being designed for listening to music, the earplugs have a small size and can be used for sleeping.
A great pair of noise cancelling earplugs will be comfortable to wear, effectively blockout the noise, have a long lasting battery.
They also have a great noise isolation.
You can control how much the earplugs drown out the noise on their companion app.
This post doesn’t specify any products. It is about the future earplugs would become.