The invention relates to an article of footwear including a slipper (1) for accommodating the foot of a user, said slipper having a plantar area (3) on which an upper (4) is mounted, said plantar area including a heel portion (5) and a forefoot portion (6), said article further including an assembly including at least one module (8) and a device for reversibly combining said module under the plantar area (3) of said slipper, the module (8) including a bottom (9) on which the heel portion (5) is to be arranged, said bottom being arranged so as to extend under said heel portion while leaving the forefoot portion (6) free when said module is combined with said slipper.