SatisfounderBoot Stretcher Women Boot Tree Shapers for Knee High Tall Boots,Great Support Boot Inserts Shape Holders

Will these stretch the shaft of a boot and if so, how much. I have some cowboy boots that I need to have the shaft stretched to fit my calves.

Will these work as shaft stretchers on tight leather knee high boots ?

How do they work on Cowboy Boots?

Will this product support tall boots that are over your knee？