You are right,
The void is much greater than the bed.
But once the liner takes the footbed contour, The Molded Liner holds it perfectly in place, I have never seen one shift.

For several years...

Last, Many shops have tried to combat alignment issues with these liners.
The most interesting one I have seen was to pull out the liner and put the custom footbed directly on the boot board. Heat...

Another thought for thermal Liners that have cushioning below the foot. The soft foam can greatly hinder custom footbed function. Just a few MM of soft foam underlying the footbed can force...

Great work guys! The make shift boot spreaders are awesome!
I remember the old thermal Flex liners 15 years ago? Hahaha in New Zealand we started using Panty Hose in the process. Really, We would...