Hi Paul;
I notice wires leading into (or out of) your balaclava under your nose.
Were those to a headset or heating element?
-Kurt
Kurt,
they lead to Bose Quiet Comfort earpieces. It's a semi-customized solution I made when I discovered it was hard to hear ATC with the standard passive DC headsets and the like. The full solution I evolved is:
1. Bose QuietComfort 20 earpieces worn in the ear. They have built in noise cancelling and work really well, provided they are protected from the wind.
https://www.amazon.com/Bose-QuietComfort-Acoustic-Cancelling-Headphones/dp/B00D429Y12/ref=sr_1_3?ie=UTF8&qid=1489613323&sr=8-3&keywords=bose+quietcomfort+20
2. Passive, standard Dave Clark 13.4 headset worn over the top. There's sufficient clearance in the earcups of the DC headset to mean they are not pressing on the Bose units.
3. Open-air cockpit microphone. PA-9EHN from Pilot Communications. Much better than the standard DC mic in an open cockpit.
4. Adaptor lead. This was the trickier bit as the 1/4" RCA plug is mono and the Bose uses a 3.5mm jack. I built a custom lead with 2x 12.5kOhm resistors in it to reduce the output from the intercom and match to the Bose. I can provide more details if you want them. Took a few mins with a soldering iron, plus i needed a 3.5mm female inline stereo socket and a 1'4" mono PCA plug - all available from Amazon etc.
My partner and I use this solution when flying and it's really good - comfortable enough for long trips, works in open cockpit, (unlike normal, very expensive aviation noice-cancelling headsets from Bose and Lightspeed) and way better sound isolation than anything else I've found. The Bose headphones cost $250 but I had them anyway, and also already had the DC headset - this was the best way of combining what I had.
Cheers,
Paul.