US Patent 11771183 Negative Poisson's ratio materials for fasteners

A zipper includes two rows of zipper teeth, in which at least one of the zipper teeth includes a negative Poisson's ratio (NPR) foam material having a Poisson's ratio of between 0 and −1, and a slider movably attached to one of the rows of the zipper teeth and configured to connect the two rows of zipper teeth when the slider is moved in a first direction and to disconnect the two rows of zipper teeth when the slider is moved in an opposite direction.