Abstract: Shoe with slipper function both open and closed, of the type realised by means of perimetrical sewing (3) of the upper (2) on the sole (1), having the following characteristic: I—use of an elastically yielding flexible expanded plastic material sheet with alternatively variable thickness >2 mm and <8 mm, pierced (F) and bossed on its surface (e) and ribbed (i) on the opposite surface, the piercings being made in the thinness zones and then alternated by bossings (e); II—punching of said sheet in soles (1) and uppers (2); III—perimetrical sewing at the sole edge (3) of the upper (2) to the sole (1); IV—with the characteristic that said bossings (c) are placed towards the outside of the shoe both for the sole (1), thus toward the, floor, and for the upper, thus towards outside.