Subject: Zip Fit Boot Liner warmth.
Question #1:
I would like to input from those experienced as to the WARMTH FACTOR of;
Injected Foam liners versus ZipFit, and
Zip Fit liners versus Standard liners

I have Tecnica brand Foam boots (“Carbon”s softened to “X”)
After considerable post injection fitting, they are 99% comfortable.Warm enough above fourty degrees Farenheight, but specifically in the aughts or teens through twenties or even the thirties are cold to cool.

Question #2:
What is the STIFFNESS FACTOR of;
Injected Foam liners versus ZipFit, and
Zip Fit liners versus Standard liners?, assuming ZF Sidewinders.

Thanks,