Layering Up: Why What’s Underneath Your Arc Flash Kit Really Matters
Published 09 Apr 2026
layering up: why what’s underneath your arc flash kit really matters
When workers think about arc flash PPE, the focus usually lands on the visible outer layer – the coverall, jacket, trousers that carries the certification label and takes the brunt of the hazard. But that is only part of the story.
What sits underneath that outer garment can have a major effect on the overall outcome in the event of an incident. If the wrong underlayer is worn, even good outer protection can be compromised. That is why layering is not simply about comfort or warmth, it is a critical part of the protective system.
For teams working around electrical hazards, choosing Progarm manufactured arc-rated baselayers instead of ordinary everyday clothing can make a meaningful difference to protection, comfort and confidence on site.
the hidden risk of everyday underlayers
A worker may appear fully protected because the outer garment is compliant, correctly fitted and worn properly. However, underneath that outer kit there is often a standard T-shirt, sports layer or thermal garment that was never designed for arc flash exposure.
This is where the problem begins. Everyday clothing is chosen for convenience, not for its behaviour under extreme thermal conditions. In an arc flash event, heat can still transfer through the outer layer. If the garment underneath is not suitable, it can contribute to burn injury rather than help reduce it.
- Standard underlayers are not selected as part of an arc-rated PPE system
- Workforces often mix protective outerwear with everyday clothing underneath
- This creates inconsistency from one worker to another
- It can weaken the effectiveness of the overall clothing solution
That is why layering should be treated as a deliberate safety decision, not a personal clothing preference.
why arc-rated baselayers are different
Arc-rated baselayers are designed specifically to sit close to the skin as part of a layered protective system. Their purpose is not simply to add warmth. They are chosen to support the overall garment performance while helping the wearer remain comfortable throughout the working day.
A good baselayer strategy helps create a more complete barrier between the wearer and the hazard. It also gives specifiers and safety managers greater control over what staff are actually wearing beneath certified outer garments.
For organisations trying to standardise PPE across multiple teams, baselayers offer a practical way to reduce guesswork and improve consistency.
protection starts from the skin outwards
One of the most important ideas in arc flash clothing selection is that protection should be built from the inside out. The outer garment may be the first thing seen, but the inner layer is the closest to the body and therefore directly relevant to comfort and injury reduction.
This is particularly important in environments where workers need to wear PPE for long periods, move between indoor and outdoor tasks, or manage variable temperatures through the day. In those situations, baselayers can support both wearability and compliance by making it easier to dress correctly without improvising with unsuitable clothing.
If a PPE system is uncomfortable, workers are more likely to adapt it. If the system is wearable, breathable and clearly specified, compliance usually improves.
layering is not just for winter
It is easy to assume that baselayers are only useful in cold conditions, but that is too narrow a view. In electrical safety clothing, layering is primarily about system performance, not just insulation against the weather.
A well-planned baselayer approach can be relevant year-round because it supports:
- consistent protection across shifts and seasons
- better garment management and standardisation
- reduced reliance on ad hoc personal clothing choices
- improved comfort where breathable PPE is required for long hours
In other words, the right baselayer is not an optional extra. It is part of making the outer garment work as intended.
certifications and standards that matter
When specifying an arc flash clothing system, certification matters because it provides a framework for comparing garments against recognised requirements. Depending on the job, sector and wider hazard profile, several standards may be relevant.
The exact combination of standards required will depend on the application, but the key point is that a compliant outer garment should be supported by a compatible layering approach rather than undermined by unsuitable clothing underneath.
what a good layering policy looks like
For employers, the challenge is not only choosing good garments, but making sure the full clothing system is easy to understand and easy to follow. A practical layering policy should remove ambiguity and make the correct choice the obvious choice.
- Specify approved arc-rated baselayers as part of the PPE issue
- Explain why everyday underlayers are not acceptable
- Match clothing choices to the task risk assessment
- Consider comfort and wearability to support real-world compliance
- Train teams to view PPE as a complete system, not separate items
This approach helps bridge the gap between product certification and how garments are actually worn in the field.
from compliance to real-world protection
There is a difference between owning compliant PPE and achieving effective protection in practice. Real-world safety depends on how garments are combined, worn and maintained.
That is why baselayers deserve more attention in procurement and safety planning. They are not the most visible part of the kit, but they are one of the easiest ways to strengthen the integrity of the full clothing system.
For safety professionals, contractors and electrical teams, the message is clear: arc flash protection is not only about the outer shell. The right underlayers matter too.
