I highly recommend this clip-on wired mic, it's cheap and far higher quality than the price would suggest. Just plug it into your iPhone and you should see an immediate boost in audio quality.

Yeah, I have a Olympus ME-51S and a JK® MIC-J 044 but I prefer the Giant Squid. The ME-51S is nice though too. I do have a Movo WS10n windscreen muff on it too.

Helmet is either my Bell RS-2 or Arai XD3.