This full length arch support is anatomically shaped to help reduce stress on the knees, spine and hips. The semi-rigid 3/4 EVA base is flexible and waterproof. The latex/microfiber top lining aids in shock absorption and moisture management. This insole provides healthy balanced support for all arch types. Simply remove the existing insole in your shoes, and replace it with this one instead. It is best used in athletic or work shoes, as well as in boots. The front portion can be trimmed to fit as needed.