A composite elastic material including at least one reversibly necked material and at least one elastic sheet joined at least at two locations in which the reversibly necked material is formed from a neckable material which has been treated so that, upon application of a force to extend the necked material...http://www.google.de/patents/US4981747?utm_source=gb-gplus-sharePatent US4981747 - Composite elastic material including a reversibly necked material
