
To slide your shoe trees into your shoes without damaging the leather, push the front part of the shoe tree into your shoe, without forcing it.
Then use the wheel to shrink the shoe tree while inserting it into the shoe, and once the shoe tree fits the heel of your shoe properly, turn the wheel again to increase the pressure on the leather of the shoe until to stretch it as much as possible.
Plastic Travel Shoe Trees.
For more information on the use of this product you can consult the associated tutorials