A tire tread comprising a plurality of sipes (30), each sipe being delimited by two opposing main walls (31, 32), each of the said walls consisting of a mean surface of which the intersection with the tread surface in the initial condition forms an edge, the mean width of each sipe measured as the mean distance between the edges formed by the opposing main walls (31, 32) of the said sipe on the tread surface in the initial condition is at least equal to 1.5 mm, each of the main walls (31, 32) comprising at least one locking region (310, 320), each locking region collaborating with a locking region opposite in such a way as to mechanically block relative movements of the said walls at least when the tire is in contact with the road surface.