Those are open cell foam. For me, I find the closed cell foam "Howard Leight" style to be better, see https://www.amazon.com/Honeywell-Visibility-Disposable-Ear

Those are open cell foam. For me, I find the closed cell foam "Howard Leight" style to be better, see https://www.amazon.com/Honeywell-Visibility-Disposable-Earplugs-200-Pairs/dp/B0007XJOLG/ https://www.amazon.com/Honeywell-Visibility-Disposable-Earpl... Also 33dB NRR, but they work much better for me.