A shoe accessory is an item that can be added to a shoe to improve its comfort, style, or performance. The most common shoe accessories are insoles, trees, laces, and heelpads. Insoles are removable pieces of cushioning material that fit inside the shoe and provide extra support and comfort. Trees are wooden or plastic forms that are inserted into shoes to help them keep their shape. Laces are used to tie shoes together and come in a variety of colors and styles. Heelpads are small pieces of cushioning material that are placed in the heel area of the shoe to provide extra comfort and support.