Originally Posted by GusinCA
At one point I heard some company was making a helmet that had active noise cancellation built into it
Oneill had a helmet on the market that they promoted as "noise canceling". It had a factory-installed communications system with a noise-canceling microphone but the earphones in it were not noise-canceling.
Overall I'd say it was not a noise-canceling helmet. Looked like it had plenty of whistles mounted on top too.
I bought a sampler of different re-usable earplugs to find one kind that fits great and goes in easily. (Available from Aerostich.) That plus no windshields and a Shoei. Like B&Y said.