Workwear is the Key to Fighting Heat Stress

By Rich Lippert

In a perfect world, we would all work in weather-controlled environments where heat wouldn’t be a factor and comfort could be maximized. Many workplaces, however, deal with very high temperatures, and heat stress is a constant risk that requires serious consideration.

Heat stress is the single largest issue facing safety managers when combating worker compliance. If the garments are too heavy, uncomfortable, too hot or don’t cool well enough, workers are far less likely to wear them compliantly. This increases the risk of danger and can be an unpredictable factor in the work environment.

In those situations, it is critical for safety professionals to maximize opportunity for their workers remain protected from the factors that lead to heat stress. This can be accomplished through a number of tactics and through thoughtful, intentional application of preventative measures.

Unacceptable levels of heat stress are likely to occur in many scenarios. As a general rule, there are four primary approaches to the solution: modify the work, the work environment, the worker, or the clothing or equipment.

These limited options become even more constraining when considering how regulations often curb the ability to modify these factors. The work has to get done no matter the environment, but safety must also be maintained.


The most effective and practical approaches to prevent heat stress are to acclimatize workers or to modify their workwear. But there are also day-to-day measures that can be taken to prevent significant heat stress incidents.

First and foremost, encouraging your team to keeping a close eye on one another is critical to a safe work environment. The effects of heat stress can lead to miscalculated judgment, meaning a good “buddy system” will keep workers on the lookout for the signs of heat stress in each other.

Staying hydrated is another critical step. Workers should drink at least 8 ounces of water every 20 minutes to keep the body’s natural cooling processes running smoothly. Additionally, scheduling set times for breaks (preferably in a cool, shaded area) will also make sure your team has a set time to find relief from the heat.

Avoiding heat stress even goes beyond the job site: Encouraging your team to get a good night’s sleep before every shift can play a significant part in the body’s ability to fight off heat-related fatigue and discomfort.


The difficulties of avoiding heat stress are compounded when it becomes necessary to wear additional protection such as arc-rated flame-resistant garments. Added protections to the fabric decrease the rate of heat exchange significantly, so it is critical to optimize your workers’ PPE.

Ideally, FR fabric should weigh as little as possible while still providing the necessary protection level. Specified garments also need a high permeability ratio to allow for improved moisture evaporation and heat dissipation. This is due to the fact that at certain levels, sweating transitions from being a useful cooling mechanism to simply wasted hydration. To continually cool the body, sweat needs to be carried away from the skin.

Specifying the right workwear to combat heat stress can be challenging. Different environments and facilities require varying standards to be met for protecting workers from the specific hazards to which they may be exposed, and a compounding issue when considering worker protection is compliance.

It is essential to ensure specified workwear offers the right balance of protection and breathability so compliance can be achieved. There may be a number of choices on the market to consider, and one way to guarantee the right garments are specified is through a wear trial.

PPE that is too heavy, lacks breathability or traps moisture against the skin can increase the risk of heat stress. In addition to health risks, maximum work output will likely be affected, particularly if the workwear interferes with heat elimination.

Therefore, it is essential to specify lightweight, breathable garments that achieve the required level of safety for worker protection. With the right workwear specified, you can ensure your workers will wear it compliantly and remain safe and cool even in the most extreme heat conditions.

For more information, visit or call (336) 227-6211.

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OH&S Digital Edition

  • OHS Magazine Digital Edition - July August 2020

    July August 2020


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