Slide fastener

A slide fastener, having a pair of stringer tapes arranged parallel to one another and coupling members each fastened in a row to the stringer tapes, wherein the rows of the coupling members lie opposite one another and connect the two stringer tapes to one another in an interlocking manner, each stringer tape is formed from two stringer tape portions which are layered on top of one another, the coupling members each rests against a first stringer tape portion, and a second stringer tape portion is arranged on the side of the first stringer tape portion facing away from the coupling members, and the first stringer tape portion and the second stringer tape portion of both stringer tapes are bent and connected to one another at a stringer tape region facing the other stringer tape in each case, and having a slider which is guided along the rows by the coupling members, wherein the slider is designed such that a movement of the slider in a first direction connects the coupling members of the stringer tapes in an interlocking manner and releases them from one another in a second, opposite direction,

• wherein at least the first stringer tape portions of the stringer tapes have a stiffened region which extends into the bent stringer tape region, and
• wherein the stringer tapes forming a pair abut against the bent stringer tape regions when the coupling members interlock.