Field notes
What actually keeps crews working when the heat climbs past 100°F. The research, the standards, and the gear that holds up, from the people building it.

The federal heat rule is still not final. The enforcement program behind it was renewed on April 10, five years, 55 industries, and inspections that now trigger on the weather forecast.
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There is no single best cooling vest, and any list that names one is selling something. What construction, warehouse, military, and plant work each actually require.
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We read the peer-reviewed studies so you don't have to. Some cooling vests deliver exactly what they promise. Others fall apart the moment the air gets humid. Here is where the evidence actually lands.
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For some bodies, heat does not just feel bad. It hijacks the nervous system that keeps you upright. Here is who carries that risk, and what the evidence says actually helps.
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The second hot day is deadlier than the first. New Stanford research shows back-to-back heat nearly doubles the risk, and points to the gap most heat plans still miss.
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Most crews buy the wrong vest because they trust the catalog spec instead of the shift. Seven numbers actually decide it. Here is how to read them before you spend a dollar.
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Four kinds of cooling vest, four completely different ways to quit on you. A plain-English look at how each one works, and which is still cooling when the thermometer passes 100°F.
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Ice melts. Water stops evaporating. Packs run out halfway through the shift. The cooling gear crews depend on was never built for today's heat. Here is what has to replace it.
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At 80°F the clock starts. At 90°F the rules change again. What the new OSHA heat triggers really require of your site, and six moves that keep you ahead of them.
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Your building works like a greenhouse, and the fans are just pushing hot air around. Why manufacturing floors keep getting hotter, and what the sharpest EHS teams are piloting right now.
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Nearly every heat illness is preventable, yet most programs still skip the same steps. The six that matter most, and the 85°F point where the real risk begins.
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Somewhere between 85 and 100°F, both safety and output start to slide. What actually pulls the heat back on an industrial site, in five steps, and why the gear pays for itself.
Read →Summer 2026, 500-unit first batch