These are the electronic "compressor type" headsets - the Bose type just kill all sound outside the headset, these knock down the sound to safe levels and compress loud impulse type (gun shot, engine backfire) sounds, and they also plug into radios. These let any sound that is below the danger level through (using microphones on the earphones).
Wearing two-ear headphones while driving is illegal in many states, but with this type you might be able to argue out of it
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I like those headsets, they do work great. But $20-$50 vs $550? Headset would look cool, but I'd save the dough and go low tech.
I actually agree here but there are "purists" here that don't want to alter the look of the truck at all, and these are military kit so they'd look okay being worn inside them.
Modern vehicles have engines which are shrouded to kill noise at the engine compartment level, the engine compartment is then damped with loaded mass on the sheet metal to kill the low frequencies, then a soft mat to absorb the high frequencies. Inside the dampening and sound deadening is repeated with a carpet cover, and everything is attached with resilient hardware (slightly flexible but firm), and dampened some more. Extra padding is used on the wall trim, door cards, and headliner. That extra padding they put in the dash board upholstery serves to absorb sound within the cabin. Even the foam in the seats make up part of the noise reduction.
On the luxury cars, they laminate the exterior glass with an interior polycarbonate sheet with a cold lamination material (like a gel) that dampens vibrations as well.
Going that far will cost you as much as two sets of those headphones though
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