Fig. 5. A demonstration of the metamaterial fiber.

(A) A load of 5.5 N is applied to both a hollow SEBS fiber (left) and a metamaterial fiber (right). (B) One second later, the SEBS fiber has fully extended and hit the substrate, while the metamaterial fiber still holds the load and continues to slowly extend. (C) Fifteen seconds later, the metamaterial fiber has elongated substantially and continues to hold the load. Photo credit: Christopher B. Cooper, North Carolina State University.