Nemo and Chiro,
Thanks for the updates on info. Although I too have read scattered reports of Kydex's reported failure in cold climes, Kydex offers so many advantages in carry options,resistance to rot and moisture and overall durability(severe cold?), that more research would be interesting in quantifying exactly what thicknesses of Kydex failed at what temps,under what conditions etc, or if there are any comparable thermoplastics proof against severe cold. I have read that the aircrew model F1 by Fallkniven as issued to Swedish Pilots is carried in a plastic(I am unaware of the type) rig for a thigh pocket on the flight suit. I havent confirmed this,but close proximity to a warm thigh might serve to moderate plastic failure in an emergency bail out. Any mechanical engineers out there(Cobalt,RJ Martin) that can comment on cold weather versus Kydex? Heading over to Kleerdex for info. If memory serves me, I believe Rob Simonich had some difficulty with Kydex and cold weather failure in the brutal Montana winter. Later guys, and thanks.
Stay safe and all the best, Phil <------<