The invention consists of a safety device that can easily be incorporated into any type of waterproof clothes and work clothes and is designed for protecting people who accidentally fall into the sea, insulation against low water temperatures, as well as a heat source that considerably prolongs survival time in low-temperature water being provided. The invention comprises: a main ring-shaped bag (1), the outermost part of which is provided with a plurality of long, narrow secondary bags (5); and a check valve (3) arranged on the surface of the main bag which contains sodium which, upon contact with water, causes a chemical reaction that seals possible points at which water could enter the clothing and further provides a heat source for the body.
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