Higher quality shoe trees are made from softwood, usually cedar, which helps control odor and absorb moisture.
Among wooden shoe trees, there are generally three categories, which correspond to price and quality.
Although they help with odour, and will help preserve the original shape at the front of the shoe, the narrow knob on the heel puts excess pressure on one section of the heel and prolonged use may deform the shoe.
[1] Notwithstanding, this style of shoe tree is popular with high heels because of its flexibility.
The twin-tube shoe tree, cut from a generic last and featuring a fully articulated (round heel), a spring toe, and ventilation holes.
[2] Shoe trees may also be made of plastic or stamped sheet metal, with or without a coiled steel spring stem; these are typically cheaper, lighter, and are better suited for traveling.