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Did you ski on them or are you in your living room wearing them around?
Assuming the boots fit correctly... they will require a few runs to work them in....the cold will make them stiffer of course, but you really need to ski them a bit before you decide to do anything dramatic.
If you still aren' t satisfied after a few days...go see the bootfitters that you bought them from (assuming you did see a proffessional in the first place) they will make modifications---see megazord post---
Now if you bought them online, and haven' t actually used them of course, attempt to send them back because they might not fit or might not fit you footshape properly....
Good luck