ColdVest has the potential to save thousands of lives around the globe each year.” Heat stroke poses a particularly deadly threat to military personnel performing strenuous activities and wearing heavy gear in scorching environments; outdoor workers including construction crews, farmers and landscapers who are exposed to direct sunlight and high temperatures for long hours; firefighters battling blazes; and athletes training and competing in hot weather conditions. Heat stroke is especially dangerous for young athletes or those unaccustomed to extreme temperatures.