The development of highly flexible thermal insulation materials with multifunctional properties based in polyimide polymers and designed to provide significant radiation abatement is proposed. These new material forms provide their enhanced properties while ensuring benign behavior in adverse thermal environments ranging from cryogenic to elevated temperatures. In addition, the introduction of radiation abating materials into the polymeric precursor or foam provides a protective element not available in current state-of-the-art insulation materials. The proposal team provides a fundamental understanding of the chemistry and physics of polyimide foams, the test facilities for measurement of structural and mechanical properties and production facilities sufficient to produce materials in volume necessary for prototype tests in NASA applications.