To provide a forming material that is suitably used for an application and member required to have lightweight properties, rigidity and impact resistance.

This heat-shrinkable improved fabric comprises: a twisted yarn cord (fiber A) of an organic fiber that has a melting point of 200°C or higher and a tensile breaking strain of 10% or more; and a twisted yarn cord (fiber B) of a fiber that has a thermal shrinkage of 1% or less when being left in an environment of 200°C for 10 minutes. A composite material containing the same, and a sandwiching material containing the same as an impact-absorbing material.