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

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

Thanks, noah