I am pondering the purchase of the Volant, Helios, or Hyperion. I need on jacket that can be part of my summer sleep system (light bag with jacket) and my Winter climbing jacket. The Winter temps should be no more than 10 to -10. I am sure the Volant will be OK at those temps but how about the Helios or Hyperion. This would be part of a layering system, thermals, windshells, fleece, and then the FF Jacket.
Also I need advice on the fit. A Patagonia size L R2 fleece fits me perfectly.