Not all 3M earplugs are created equal. These[1][2][3], for example, are steaming piles of hot garbage. I carry a pair of 3M compact 21 dB NRR earmuffs because they're superior to these earplugs that are way too common in our production environment. The skull screws and corded variant are particularly egregious because they have a plastic stem embedded in the foam that can make insertion really uncomfortable and potentially hazardous if you slip or get smacked on the ear.
[1] https://www.3m.com/3M/en_US/p/d/v000153037/