A cooling body wrap for rapidly inducing hypothermia, includes: (a) a fluid-impermeable, flexible, conformable envelope; (b) a mixture of from about 20 to about 90 weight % of alkanes having a carbon chain length of between 10 and 14, and from about 10 to about 80 weight % of a gel or viscous fluid carrier in which the alkanes are relatively evenly distributed, the mixture being sealed within the envelope; (c) at least one layer of insulation adjacent to a first side of the envelope; and (d) fastening means for fastening the body wrap around a body part.