When most people think about fire and safety gear, they picture the outer shell, the turnout coat, the pants, the helmet, the gloves.
The big, visible layers that define a firefighter’s protection.
Yet the reality is, what’s underneath the gear can be just as critical to protection as what’s on the outside.
The base layer, that first layer of clothing against your skin, is the foundation of your PPE system.
It’s your last line of defense if everything else fails and yet it’s often the most overlooked piece of gear on the job.
I’ve worked in this space long enough to see a pattern- we spend hours discussing compliance, certifications and outer-shell performance, but almost no time talking about what goes under it all.
Kelly Franko
Many people assume that any lightweight cotton tee or moisture-wicking shirt will do.
But, when we’re working around heat, flame, or electrical energy, those everyday materials don’t offer protection and synthetics can become a serious hazard.
Athletic wear base layers melt, cling and cause additional burn injury when exposed to high heat.
Synthetics used in most athletic wear are designed for comfort, not survival.
They may wick moisture, but they also melt at relatively low temperatures.
Even standard cotton, while better than polyester, can still ignite and continue to burn. It does not protect.
That’s why we need to start treating the base layer as a true piece of PPE, not a comfort garment, not an afterthought and not something that workers have to figure out for themselves.
When we talk about PPE equity, I often focus on women because they’ve been historically underserved in the design and fit of protective apparel.
But, base-layer safety affects everyone. Burn injuries don’t discriminate based on gender and neither does heat.
The challenge is that for too long, base-layer guidance has been vague or inconsistent.
Kelly Franko
Some departments tell workers to wear cotton. Others say “no synthetics.”
Some don’t mention it at all. Without clear standards and education, we’re leaving a critical piece of protection up to personal interpretation.
Every employer, safety professional and firefighter must recognize that the layer closest to the skin plays a key role in overall protection.
Your base layer does more than keep you comfortable.
Kelly Franko
It directly influences how heat transfers to your body and how moisture evaporates during heavy exertion.
In a high-temperature event, that layer can determine how quickly your body absorbs heat.
Flame-resistant (FR) base layers are made from fabrics that self-extinguish and won’t melt when exposed to heat and fire.
They’re designed to maintain a protective barrier between your skin and the thermal energy around you.
If you’re a safety manager, training officer, or department leader, here’s where I believe we can start shifting the conversation:
One of the most common pushbacks I hear is comfort.
People say FR base layers are too hot, too stiff or too expensive.
But, technology has come a long way. Today’s FR fabrics are breathable, moisture-wicking and soft to the touch. They look and feel like premium athletic wear, only they’re built to protect, not melt.
When workers feel comfortable and confident in their PPE, compliance goes up.
They stop looking for shortcuts. They wear their gear properly. That mindset shift can have a bigger impact on safety outcomes than most rule changes ever will.
This conversation isn’t about adding another layer of regulation or cost; it’s about changing how we think about protection.
True safety culture means addressing risks before they become incidents, even if that means challenging long-held assumptions.
Kelly Franko
For years, we’ve done the best we could with what was available. Now, we know better.
We have access to fabrics and technologies that make it possible to be both protected and comfortable.
We owe it to every firefighter to make sure that protection starts from the skin outward.
I often tell people: your PPE is a system, not a collection of parts.
Each layer plays a role and the weakest link can define the outcome.
The base layer may not be the most visible or exciting part of that system, but it is the one that directly touches your skin every single day. That’s where protection truly begins.
So, as you review your PPE policies and gear purchases this year, ask one simple question: What are my people wearing underneath?
If you can’t answer that with confidence, it’s time to start the conversation.
