The authors report a novel strategy to create fibrous, isotropically bonded elastic reconstructed (FIBER) nanofiber-assembled cellular aerogels (NFAs) with a hierarchical cellular structure and superelasticity. By combining electrospun nanofibers and the fibrous freeze-shaping technique, they achieve large-scale production of FIBER NFAs with tunable densities and desirable shapes. These NFAs exhibit densities greater than 0.12 mg cm\(^{-3}\), rapid recovery from deformation, efficient energy absorption, and multifunctionality in thermal insulation, sound absorption, emulsion separation, and elasticity-responsive electric conduction. The successful synthesis of such materials opens up new possibilities for multifunctional NFAs in various applications.The authors report a novel strategy to create fibrous, isotropically bonded elastic reconstructed (FIBER) nanofiber-assembled cellular aerogels (NFAs) with a hierarchical cellular structure and superelasticity. By combining electrospun nanofibers and the fibrous freeze-shaping technique, they achieve large-scale production of FIBER NFAs with tunable densities and desirable shapes. These NFAs exhibit densities greater than 0.12 mg cm\(^{-3}\), rapid recovery from deformation, efficient energy absorption, and multifunctionality in thermal insulation, sound absorption, emulsion separation, and elasticity-responsive electric conduction. The successful synthesis of such materials opens up new possibilities for multifunctional NFAs in various applications.