I am using racing headphones that are a 25db noise
reduction over ambient. They have a liquid type seal
that covers the ears to block out the noise. I've used
this type of headphone at races for over 4 hours at a
time and while they fit tight their not too
uncomfortable. Only when I wear sunglasses.
On the radio they work very well. When ambient noise
is blocked out (better S/N for the brain) I can hear
very weak signals.
There are a number of suppliers of racing headphones
like Racing Electronics and Racing Radios and probably
many more. Many with mics attached.
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