I noticed their website mentions up to 32 dB attenuation. What does this mean in practice? A set of 3M Peltor X5 earmuffs have only 31 dB NRR, and NRR is a stan

I noticed their website mentions up to 32 dB attenuation. What does this mean in practice? A set of 3M Peltor X5 earmuffs have only 31 dB NRR, and NRR is a standard metric for ear protection. The Sennheisers don’t look anywhere near as isolating as the 3M muffs. Personally I use the construction earmuffs for drumming.