This is what's used a lot in motorsport as race cars are insanely loud. Mine was pumping out north of 120db at one point at a 1m static noise test at 4500rpm (went to 7600rpm... and you sit less than 1m from the exhaust..)

I had full impressions done with custom in-ear monitors and I've never been happier. Makes plane flights absolutely tolerable too.

In-ear monitors vs sleeved (like eytomtic slip-ons) are much better practically day to day as the wires exit flush with the bottom of your earlobes (needed for getting helmets on and off) which means beanies, sleeping on a plane etc you can rest the side of your head on something without wires/end of the monitor.

Around $700NZD / $300USD done here in NZ.