Shoes dried out naturally on shoe trees make the best start for a nice polish. They help them keep their shape and look new for longer. Ideally the shoe trees should be placed in the shoes as soon as they have been taken off, even if damp. Allow the shoes to rest for as long as possible to regain shape and be thoroughly dry before wearing again. Due to this it is generally advised to alternate footwear daily. Size Guide Small 2, 3, 3.5. Medium 4, 5, 5.5. Large 6, 7, 8.