While not 3M's product nor the CAEv2, I have several pair "plain ol" soft rubber/silicone earplugs with a similar flange setup. I've noticed they tend to easil

While not 3M's product nor the CAEv2, I have several pair "plain ol" soft rubber/silicone earplugs with a similar flange setup. I've noticed they tend to easily slide out of position just slightly. A bit of ear wax, a bit of sweat, a swallow, etc nudge them just enough to break the seal. Since they're a fully sealed earplug, it's obvious when they shift and I push them back in. I could only imagine how frustrating that shifting would be in combat with these.