A shoe tree is a device used to maintain the shape of shoes, particularly leather ones. It is typically made of wood, plastic, or metal and is inserted into the shoe when not in use. Shoe trees help prevent creasing, stretching, and moisture buildup, extending the life of the footwear. Using a shoe tree can also improve the fit of shoes over time. By keeping the shoes properly shaped, they can remain comfortable and stylish. Many people choose wooden shoe trees, as they can absorb moisture and odors, making them a popular choice among shoe enthusiasts and collectors.