We have developed a novel type of polymeric materials such as slide-ring (SR) materials and pseudo-polyrotaxane (PPR) nanosheet with cyclodextrins (CyDs). In the SR materials, polymer chains are topologically interlocked by figure-of-eight cross-links. Hence, these cross-links can pass along the polymer chains freely to equalize the tension of the threading polymer chains similarly to pulleys. Recently, we have just reported the stretch induced crystallization of the SR gel, which leads to extremely high toughness and recoverability. The concept of the slide-ring gel is not limited to cross-linked gels but also includes elastomer, cross-linked polymeric materials without solvent. Accordingly, it can be applied to wide area such as paints, rubbers, soft actuator, resins and so on. The slide-ring materials were used as a key technology to create tough polymers for automobile. For instance, the mechanical properties of polyamide resins and carbon fiber reinforced plastics were improved drastically.