a honeycomb sandwich cast for supporting human or animal body portions . the cast has inner and outer cast layers which , in the finished cast , are rigid , and a central honeycomb core having honeycomb cells which are perpendicular to the skin of the underlying body portion . the honeycomb is securely attached , e . g ., mechanically locked or bonded to the cast layers to form an integral , high strength , low weight honeycomb structure . an indentable , resiliently compressible fabric such as reticulated plastic foam may optionally be positioned between the faces of the honeycomb core and the cast layers . with use of such a foam , when the outer layer is applied normally by wrapping a bandage - like fabric about the body portion and the surrounding honeycomb core , a compressive force is generated which presses portions of the foam structure into the honeycomb cell openings to form a more secure interlock and prevent relative movement between the components of the cast . the foam structure can subsequently be rigidified to form a mechanical interlock between it and the honeycomb .