Abstract: The present invention relates to a self-scalable casual footwear that allows involve two subsequent footwear sizes, comprising an upper of bi-elastic material (1) and a mono-elastic (2), a bi-material outsole (3) and a mounting insole (4). Such footwear does not require additional components to fit, such as laces, rubber bands, straps, velcro, zippers, hooks, eyelets or any other that is treated as a resource for the purpose of this invention.