The choice of protective barrier in your turnout gear has the most impact on breathability — more than any combined choice of outer shell and thermal barrier. If your body’s heat cannot escape from your gear, you run the risk of elevated heart rate, raised body core temperature, and accelerated dehydration, potentially leading to impaired decision-making and heat exhaustion events.
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PPE
W. L. Gore & Associates, Inc.
Oct. 3, 2007