Abstract: A self-contained active thermal regulating device includes a flexible, deformable outer membrane; a liquid saturated foam core contained therein having a dimension substantially coincident with the outer membrane wherein the liquid is at least partially circulable throughout the foam core; and, a phase change material being in intimate contact with the circulable liquid. The circulation of the liquid is effective to transfer heat between the flexible, deformable outer membrane and the phase change material to cool (or heat) the device without use of external power and the saturated foam core in cooperation with the sealable flexible membrane providing a substantially uniform, thermal regulating medium and structural support such that the device is readily, uniformly deformable when a load is applied thereto.