I purchased shoe trees for both my "good" pairs of (leather) shoes. I found that within the first two weeks, they both fit a little more loosely from the ball of my foot forward. I didn't intend for it to be that way, but that's how it worked. Shoe trees will apply constant pressure, so as the leather begins to stretch a little, it will keep the tension on it.
I would imagine that if you buy a shoe tree that's sized a little on the large side for your shoes, so that it's a tight fit into the shoe, you'll get more stretching action than a properly sized one.
Shoe trees are a good idea anway.












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