A shoe-reinforcement material (33) having a fiber combination (1) with a first fiber component (2) and a second fiber portion (4,5) having a second fiber component (3), whereby the first fiber component (2) has a first melting point and a first softening-temperature range lying below it, and a first fiber portion (5) of the second fiber component (3) has a second melting point and a second softening-temperature range lying below it; the first melting point and the first softening-temperature range are higher than the second melting point and the second softening-temperature range, the second fiber portion (4) of the second fiber component (3) has a higher melting point and a higher softening temperature lying above it than the first fiber portion (5), and the fiber combination (1), in consequence of thermal activation of the first fiber portion (5) of the second fiber component (4), attached thermally with an adhesive-softening temperature lying in the second softening-temperature range, with water-vapor permeability retained in the thermally attached region.