It looks like you're new here. If you want to get involved, click one of these buttons!
Come next July Ranulph Fiennes will be out in temperatures possibly into the -80Cs if that's any help. Don't know if he's going to be doing any running while he's there.
Okapi you could always splash out on a Camelbak thermal control kit
For those of you who have problems with ice in the bottles of your hydration belt: Wear the belt inside your jacket and tighten the drawstring in the bottom of the jacket.