See my posts above, where I showed the data for the all the frequencies. "Trevor" is trying to justify his "cool guy tactical" earpro, and spreading BS. First he's flat out wrong about NRR, as you can't put the EPA NRR label on and cherry pick frequencies. Also, when comparing the data for the individual frequencies the MSA Sordin earpro way underperforms when compared to larger earpro.
If you need low profile earpro for use with a helmet, then the MSA Sordin gear is a great choice. If you won't be using it with a helmet, then you're sacrificing hearing protection for no reason.