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Talked to a couple of bootfitters about these... concensus seems to be that they're a band-aid for a poorly fitting boot, if you use them like they're intended (down the front) then you'll just end up further backseat.
If you've got enough room to fit a pair of these down the front of your boots and not be in complete agony either your liners are f*cked and you should buy some aftermarket Intuitions, or your boot has completely the wrong cuff shape for your leg.