Abstract: A system and method for body cooling is disclosed for use with a cryogenic mixed gas storage and delivery apparatus, the storage apparatus including a compact and lightweight dewar for containing cryogenic temperature mixed gas at supercritical pressure. The system includes a garment having a fluid circulation network thereat and a plurality of heat exchangers receiving cold mixed gas expelled from the dewar for heat exchange to cool fluid in the fluid circulation network. Different ones of the heat exchangers also provide for heat input to the dewar to maintain gas therein in a single phase and provide continued expulsion energy and for warming of the gas for end use. No electrical input for fluid circulation is required.