A shoetree is a type of footwear storage unit that is designed to help preserve the shape of shoes and boots. It is typically made of wood or plastic and has two parts, one for each shoe. The user places the shoe in the tree and then adjusts the tension to ensure the shoe is held firmly in place. Shoetrees are often used to store shoes when they are not being worn, as well as to help them keep their shape when they are not being worn.