Breast binding is the material used in, or the act of reducing visible breast size in, both women and men through the use of constrictive materials. Common binding materials include: * Cloth strips * Elastic or non-elastic bandage * Purpose-built undergarments (often using Lycra or other synthetic fiber) * Simple layering of shirts, from tight to loose There are many reasons men and women would want to bind: * As a way to reduce movement after an injury or surgery, to help speed recovery * To hide breasts or breast development * For beauty and aesthetics