Assuming they are made of leather--do what Gunther said, soak in warm water and wear until dry--hopefully you get this done in a day, because the fairer sex does not like boots in bed but do not take off until dry. When dry, work in paste mink oil with fingers (good for your skin) and then melt the mink oil into the leather (especially the welt area) with your hair dryer!! Boots should stay pliable and relatively water resistant for a good while.