The Adjustable heel lift is intended for use in closed-heel shoes under the insole or footbed, as you will be most comfortable if both feet rest on the original insoles or heel padding. The Adjustable Heel Lift is available in three sizes and can be trimmed to fit most shoes. While Adjustable lifts can be moved from one pair of shoes to another, they are best permanently left in place in one pair of shoes, to allow them to conform to the shape of the shoe. If you ever wish to clean the Adjustable lift, for example to remove foot powder that adheres to it, simply wash it in water and a mild detergent and dry. You may separate the layers to wash it if you wish, and re-stack them after drying. This will refresh the self-stick quality that makes the layers adhere to each other.