Three-dimensional(3D)nanofibrous aerogels(NFAs)that are both highly compressible and resilient would have broad technological implications; however,creating such NFAs has proven extremely challenging.Here,we report a novel strategy to create fibrous,isotropically-bonded elastic reconstructed(FIBER)NFAs with a hierarchical cellular structure and superelasticity by combining electrospun nanofibers and the fibrous freeze-shaping technique.Our approach causes the intrinsically lamellar deposited electrospun nanofibers to assemble into elastic bulk aerogels with tunable densities and desirable shapes.The resulting FIBER NFAs exhibit densities of > 0.12 mg cm-3,rapid recovery from deformation,and multifunctionality in terms of the thermal insulation,sound absorption,emulsion separation,and elasticity-responsive electric conduction.The successful synthesis of such fascinating materials may provide new insights into the design and development of multifunctional NFAs for various applications.