Our solid earplugs attenuate (reduce) the most. A pair of sleep plugs reduces about 30-33 dB. For industrial noise, the PACS Pro31 and PACS Pro27 are the highest attenuating filters: both class 5. We also sell MaxBlock custom canal earplugs, which block most noises. PE Max Block custom fit earplugs block out as much sound as possible, with little ambient awareness required.
Kindly note that it is not possible to block out all sound, not even with a custom product, as sound also travels through the bone structure of your head, for example.