BaltoThe amount that thin pliable neoprene would be able to push your heal back in a properly fitting boot would be next to nothing, again you need to learn to pout on a ski boot if you think you are actually being aided in setting your heal with the use of a toe cap.
Oh yeah if you were using those super thin ones it would do very little. We use the 32 ones thgough which are a foam. They make the foot bigger so work very effectivly for intial molding.
If you think about it the liner mainly packs out and gets bigger because the foam behind the heel and ankle is compressed. This is the same thing we are doing with toe caps. We are just speeding up the bedding in of the foam to make the toes comfier from day one.
I speak to lots of fitters who do think its to push the toe out only, but once you relise its actually working more on the back of the liner you can do some interesting fitting solutions for customers.