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The victims of flood or drowning often experience hypothermia due to the quick body temperature drop after immersing in water over a long period of time. The worse case may be death.
Heat Tech Lifebuoy adds the material that emit heat in water in the red blocks of the outer and inner side of the tube, so that the tube can maintain the body temperature of the underarm and upper body parts, which easily experience temperature drop. The victims wearing the tube can maintain their body temperature while waiting for rescue.