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Preheat your oven to 250 degrees. Remove the liners from your boots and place them in the oven one at a time for between five and eight minutes.
Cut off the toe end of a pair of old, thick socks—making sure the piece of material is big enough to cover your pinky toe. Wrap a few layers of Duct tape around the sock toe to create a toe cap. Remove the footbed from your boot liner and slip the toe cap over the end of the footbed (shown here).
Place your foot on the footbed, with your toes under the toe cap. Put a thin skin sock over your foot and the footbed.
Remove the liner from the oven after five to eight minutes (it should be warm by now) and slide the liner into your boot. Slide your socked foot (with the toe cap and footbed inside the sock) into the boot. Kick your heel on the ground to create a heel pocket and make sure your heel is all the way back in the boot.
Once your foot is in nice and snug, stand with your toe on a one-inch-high block (a book or piece of wood works nicely) and lean forward. Stand like this until the liner has cooled, roughly 10 to 12 minutes. Then pull your foot out of the boot and remove the sock and toe cap. Then put the sock back on and step into the boot to see how it feels. You’re all done.