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get a boot fitter to fit your boot with them
best solution is get real orthodics from a bootfitter...or
get some cardboard put on your shell's boot board either from a shop that carries this material or try it yourself from cutting up some cardboard. Take out the bootboard first and then trim to fit. Some shops glue it down anfter a couple test rides...
or buy a shoe insole from a department store / drug store show store and trim to fit either into the liner or on the shell's boot board..
or cut cardboard to fit the sole of the boot liner and put it under the superfeet support.
or if u have a heatfit / thermo fit liner that u heat up to fit to your feet, run a heat cycle and refit them... they come back a little bit - maybe u got go to a shop for that or figure out how to run a hot hair dryer into the liner...
or wash out your liners - not in the washing machine but with warm or hot water in the laundry tub or with the showerhead from the shower... u dont need to use soap but the water will rinse out the sweaty salt and the liner will come back to life. Hot water may shrink the liner or have the thermo fit come back. BUT it takes a week to dry out unless u got a boot dryer.
or wear thicker socks...
Generally the the cuff/ankle and instep arch buckles count the most for support and control people can usually ski well without the toebox fitting tight. good luck.