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The Salomon S-Pro HV also has two PU Sensifit inserts on both sides of the shell in order to make it easier to step into the boot. The S-Pro has the insert only on the external side of the boot.
If you are looking for a ski boot with a little more volume, the S-Pro 100 HV would likely be the better option. If you'd like to speak with a boot fit expert you can always go into your local REI store or set up a virtual outfitting appointment and connect from the comfort of your own home.
Hopefully this helps, thanks!
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