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Heat Stress and PPE

Protective gear keeps hazards off the body, but it can also keep heat in. Balancing protection and heat is a planning job, and it starts before anyone puts anything on.

Why does PPE add to heat stress?

Coveralls, gloves, boots, respirators, and hats limit how well the body cools. Sweat cannot evaporate, and the air next to the skin can get hot and humid. The same gear that protects you from a chemical can make a hot day more dangerous.

Heat illness can progress quickly, and people often do not notice early signs in themselves. Official information is available from NIOSH, OSHA, CDC, and the National Weather Service.

Chemical-resistant suits and coveralls can be particularly hard on the body in warm weather because they are made to keep liquids out, which also keeps sweat in. Plan these jobs deliberately.

What are the warning signs?

Early signs can include heavy sweating, headache, dizziness, nausea, muscle cramps, and unusual tiredness. More serious signs include confusion, fainting, or a very hot body. This article is not a medical guide; use official sources for details.

If someone seems seriously ill from heat, call 911. Move them to a cooler place while waiting for help, and do not leave them alone.

Some medicines, alcohol, illness, and lack of sleep can make heat illness more likely, so ask a doctor about your own situation.

• Watch coworkers as well as yourself.
• Take new symptoms seriously.
• Call 911 for confusion, fainting, or collapse.

How can I plan work around PPE and heat?

Schedule the hardest jobs for cooler hours, and rotate people in and out of PPE-heavy tasks. Build in breaks in shade or a cool area, and make water easy to reach.

New and returning workers may need time to adjust to heat. Ask OSHA and NIOSH about acclimatization guidance and about checking weather alerts from the National Weather Service.

Check the forecast the day before and again that morning, and agree on a plan to shorten or move work when a heat alert is issued. Pace matters as well: slower, steadier work with regular short rests usually leaves a person safer at the end of the day than a push to finish before noon, when the equipment is hot and the body is already working hard.

Can I choose lighter PPE?

Sometimes. Ask the maker about lighter fabrics, vented options, or cooling features, but never swap a required item for a lighter one that the label does not allow. If the label requires a specific protection, the plan has to be adjusted around it.

If a job is too hot to do safely in the required gear, change the schedule, the method, or the task. Do not drop protection to feel cooler.

Where a job truly cannot be done safely in the required gear in hot weather, postponing it is a legitimate decision.

• Follow the label for required gear.
• Ask makers about lighter options.
• Change the job before dropping protection.

What about water, food, and rest?

Drink water regularly, not only when thirsty. Eat regular meals, and avoid alcohol before and during hot work. Rest in shade or a cool place when you need it.

Follow advice from your doctor if you have a medical condition or take medicines that affect heat tolerance.

Cool drinks help, but avoid very sugary or caffeinated drinks in large amounts; ask a health professional for tailored advice.

How do I look after workers and family?

Set up a buddy system so no one works alone in heat and PPE. Agree on signals for needing a break, and make clear that anyone can call a stop without blame.

Children, older adults, and people with health conditions are at higher risk and need extra care and supervision.

Check on workers at the end of the day, because symptoms sometimes show up after work. Encourage anyone who feels unwell to rest and seek care.

What should be in the plan?

Write down who is in charge on hot days, where water and shade are, how to reach emergency help, and what the stop signals are. Review it with the crew each season.

Check with OSHA and your state about any heat rules that apply to your workplace.

Keep a phone, an address, and directions to your field accessible for emergency callers, because a dispatcher will ask where you are.

• Name the person in charge on hot days.
• Mark where water and shade are.
• Agree on stop signals and emergency contacts.

Last reviewed: November 12, 2026. Written by the Farm Safety Editorial Team. See our editorial policy.