The invention relates to an applicator for a cosmetic product, comprising a core having a first end, referred to as a proximal end, and a second, free end, referred to as a distal end, a plurality of protrusions projecting from the core, and a plurality of plates also projecting from the core, wherein the protrusions and the plates are moulded with the core, the core is curved in its direction of extension so as to define a concave part and a convex part, and wherein the protrusions extend substantially over the concave part of the core and the plates extend substantially over the convex part of the core. The invention also relates to an associated applicator assembly.