Product Details: Shoe Tree: The longer the shoe tree stays in place, the stronger the support for the shoe. Scope of application: High-top shoe trees are suitable for high-top shoes and boots with laces or zippers. (High tops and boots) Boots without zippers and laces are not suitable). How to use: 1. Unzip the shoelaces or zipper2. Turn the upper round button clockwise to extend the length 3. Twist the golden plum blossom buckle clockwise to expand the length. Product information: Name: High-top shoe expander Size: 36-39, 39-42, 43-46 Specifications: 1 pack (universal for left and right) Color: red, green Suitable season: Spring, Autumn, Winter, Summer Scope of application: High-top shoelaces High-top shoes with laces or zippers can be used