Personal Cooling Systems produce a cool, refreshing, safely regulated temperature output of 55-60°F- regardless of ambient temperature or humidity level. Personal cooling systems reduce the risk of heat stress. These cooling systems are essential to mitigate the possible effects of overexposure to excess heat or overexertion. Personal cooling system is used with protective ensembles to reduce the effects of physiological and environmental heat stress. This system is used to alleviate symptoms of multiple sclerosis and to prevent increased core temperature during daily activities. The effectiveness of personal cooling systems depend on the metabolic rate, the body surface area that is covered, the capacity of the heat sink, the maximum gross rate of cooling and the environmental conditions. The use of personal cooling systems is popular in hot industries.