Music-loving helmet-wearers, take note of these nicely designed mini-speakers (as in
earbuds). From the manufacturer’s website:
O-tus near ear speakers are much safer than ear buds. Ear buds act like earplugs and block sound from coming to your attention. O-tus speakers mount on your helmet with a really cool fastening material and thus do not block other sounds from reaching your brain.
I hope they’re compatible with beer hats.