The burgeoning field of metamaterials was brought about by the demand for materials with exotic properties beyond the reach of natural materials, such as a negative refractive index . Most metamaterial development work has focused on engineering the real part of the effective permittivity and/or permeability . However, a recently proposed perfect metamaterial absorber has drawn attention to the oftoverlooked imaginary part of the optical constant,  which can be manipulated to create high absorption. Compared with classical absorber designs such as Salisbury screens, metamaterial absorbers can possess much thinner structures, rendering them more suitable for radar and tracking applications. Nevertheless, most up-to-date metamaterial absorber designs, covering the RF  and THz  up to Near-IR  wavelengths, function only at either near-normal incidence or for a single polarization. In this paper, we propose single-band and dual-band flexible polarization-insensitive metamaterial absorbers with wide field of view for the mid-infrared band. The structures are based on a thin (∼λ0/15) bilayer metallo-dielectric stacks with the design parameters optimized via a genetic algorithm (GA), which has been proven to be a robust methodology for evolving complex structures with customized electromagnetic properties .