A tyre (1) comprising a tread band (2), on which a plurality of blocks (8a) are defined, in which blocks at least one three-dimensional sipe (10) extending in a direction that is incident to an advance direction (F) of the tyre is made; the three-dimensional sipe (10) separates the block (8a) into a first block portion (11) comprising a first surface (13) facing in the advance direction (F), and into a second block portion (12) comprising a second surface (14) facing in the direction counter to the advance direction (F); a plurality of male/female couplings are provided between the first and the second block portion (11, 12), and all of these couplings are formed by a plurality of protuberances (15) formed on the first surface (13) and extending towards the second block portion (12), and by a plurality of recesses (16) formed on the second surface (14) and extending away from the first block portion (11); the protuberances (15) provided on the first surface (13) have an apex (20) thatis spaced apart from the tread surface (3) by no more than 40 % of the depth of the three-dimensional sipe (10), measured at the apex (20)