I tried industrial earmuffs for a while (-25 dB), when I was in a noisy office, and they work. With another "layer" of in-ear phones you can work anywhere. They

I tried industrial earmuffs for a while (-25 dB), when I was in a noisy office, and they work. With another "layer" of in-ear phones you can work anywhere. They also send a stronger signal of "don't bother me", but some will find it rude.