A tire, the tread of which has an equatorial plane and at least one raised element, which has a longitudinal axis and respective lateral edges substantially parallel to the equatorial plane, and sipes crosswise to the longitudinal axis; and wherein at least one sipe is Z-shaped and defined by three consecutive portions, a first and a third portion of which are end portions originating at respective lateral edges, and a second portion of which is an intermediate portion connected to the first portion at a first point, which is located a first distance from the lateral edge from which the relevant first portion originates, and to the third portion at a second point located a second distance from the lateral edge from which the relevant first portion originates; the intermediate portion sloping with respect to the longitudinal axis, and the second distance being less than the first distance.