phil parker wrote:As well as reading the books - I have attended lectures by both Rob Lilwall and Alistair Humphreys, but the question of clothing-type or keeping warm never really arose? It would be worth checking them out, and others as above, to see what they recommend. I have been at those temperatures on numerous occasions, but not cycling (climbing or walking) ironically, in Iceland as well in February, but it never got that cold.
I would go for a 3-layer system, with a good merino base layer and a down mid trouser (I use PHD down trousers) with a good, robust windproof outer, even a salopette-type - if they will give you enough movement. I have never really sweated much, even with physical exertion, in those temperatures unless it warms up to above about -15 with a really strong sun at altitude.
There is often a big difference between day and night-time temperatures and we were always advised not to work the lungs too hard to avoid bronchial problems. It sounds like a good adventure - good luck!
thats great advice I will add them to the list, part of the fun is reading up on the places you visit and the preparation. I had looked at down trousers and may look again!