An FR shirt protects the skin it covers, and only while it is worn the way it was designed to be worn. Sleeves pushed to the elbows, a shirttail hanging out, an open collar or a film of oil in the fabric can each undo what the material was built to do, and none of that shows up on a spec sheet.
This guide walks through a two-minute routine for putting on an FR shirt, from reading the label to checking your tuck, with the reason behind each step. It also points to the NKE Safety Apparel FR shirts that suit different ways of working, so you can match the shirt to your habits as well as your hazard.
What an FR shirt does, and what it can't do
A flame-resistant (FR) shirt is made from fabric that resists ignition and stops burning once the flame source is gone. An ordinary work shirt can keep burning, or melt against the skin, once it catches.
Two limits are worth knowing before you get to the wearing part:
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FR garments are built for short exposures. NFPA 2112 covers flame-resistant garments for areas at risk of flash fire, and the current title of the standard refers to short-duration thermal exposures. They are not designed for continuous heat.
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"FR" and "arc-rated" are not interchangeable labels. ASTM F1506 is the performance specification for flame-resistant and electric-arc-rated clothing worn by electrical workers, and it puts the job of assessing the hazard and the arc rating needed on the end user.
Which standards apply to you comes from your employer's workplace hazard assessment, which OSHA requires under 1910.132(d), not from a shirt's marketing copy. If you are sorting out the terms, our guide to arc-rated vs. flame-resistant clothing explains how they differ.
How to put on an FR shirt: 6 checks before you start work
Check the label, inspect the fabric, check what is underneath, fasten everything, tuck in, and keep FR on the outside. In order:
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Read the label. Confirm this is the shirt your site assigned for your hazard, and that the standards and any arc rating on the label match your site's assessment.
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Inspect it in good light. Look for holes, burn marks, thin or threadbare patches, split seams, and broken snaps or buttons. Damage means stop wearing it until it is properly repaired or replaced.
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Check what is underneath. Under-layers should be flame resistant or a natural fiber such as cotton, never a synthetic that can melt. Your site's policy has the final say.
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Fasten everything. Close the front, fasten the cuffs at the wrists, and leave the sleeves down.
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Tuck in. Put the shirttail inside FR pants, then reach, bend and twist to confirm it stays put.
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Keep FR on the outside. A non-FR jacket or hoodie over an FR shirt can ignite or melt on top of it. If you need warmth, use FR outerwear.
The sections below explain the three steps people skip most.
Why sleeves stay down, even on a hot day
Arc-rated and flame-resistant clothing protects only where it sits between you and the heat source. Bare forearms get the same injury they would get if you had never put the shirt on. Virginia Tech's environmental health and safety office puts it plainly: exposed body parts are unprotected, so sleeves and collars stay buttoned for electrical work.
Rolling sleeves up feels like a fix for heat or a messy job, but it trades a comfort problem for a burn risk. Fix the heat instead. Pick lighter-weight FR fabric (see our guide to lighter-weight FR workwear for hot shifts) and use the breaks and cooling steps in your site's heat plan.
Tuck, fit and the air gap
The NFPA 70E clothing guidelines, as FR manufacturers quote them, call for clothing that covers exposed areas as completely as possible, shirt sleeves fastened at the wrists, and the shirt tucked into the pants. The reasoning is simple: an untucked hem lets heat and flame travel up under the shirt to skin or to flammable layers beneath.
Fit matters too, in both directions:
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Not skin-tight. The layer of air between skin and fabric adds insulation, so a shirt that clings gives up some protection.
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Not baggy. Loose, billowing fabric snags on equipment and works its way untucked.
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Move-test it. Reach overhead, crouch and twist. The hem should stay in and the cuffs should stay at your wrists, including with gloves on.
If you feel restricted, the shirt is probably the wrong size or cut for the work. Size up or change styles rather than rolling or untucking to get relief.
Flammable residue: the hazard you can't see
FR fabric can stay flame resistant and still be dangerous if it is carrying fuel. Worksite contaminants such as insulating oil, creosote and hydraulic oil do not strip the fabric's flame resistance, but they can mask it, so the fabric burns until the fuel is used up. Even where the shirt self-extinguishes, the oil or grease sitting on it can ignite and injure you.
Three practical rules follow:
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Wash FR shirts according to the care label so flammable soil comes out. ASTM's guide to home laundering FR clothing stresses that flammable contaminants must be removed during the wash or the garment's flame resistance may be compromised.
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If a shirt is soaked with fuel, oil or grease that will not come out, take it out of service.
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If your clothing is soiled with hazardous chemicals, follow your employer's laundering policy. NIOSH recommends leaving chemical-soiled clothing at work to be laundered by the employer.
For wash steps, read our guides on how to wash FR clothing without ruining its flame resistance and building an FR laundering policy.
Common shift habits and what to do instead
|
Habit on shift |
Why it matters |
Do this instead |
|
Sleeves pushed up |
Bare forearms get no protection |
Sleeves down and fastened at the wrists; manage heat with lighter FR fabric and site breaks |
|
Shirttail out |
Heat and flame can travel up under the hem |
Tuck into FR pants and re-check after bending and reaching |
|
Front or collar left open |
Leaves skin and under-layers exposed |
Fasten the shirt fully as your site requires |
|
Non-FR hoodie or jacket over the shirt |
An ignitable layer sits on top of the FR layer |
Wear FR outerwear for warmth |
|
Polyester or nylon tee underneath |
Synthetics can melt against skin |
Use an FR base layer or a natural fiber, per site policy |
|
Oily or fuel-soiled shirt |
Flammable residue can burn |
Launder per the care label; retire it if the residue won't come out |
|
Skipping the inspection |
Damage goes unnoticed until it matters |
Look it over before every shift |
For more on what goes under and over an FR shirt, see our layering rules for FR clothing.
Choosing an NKE FR shirt that fits how you work
Pick the shirt for your hazard first (our guide to choosing an FR shirt for industrial work covers that), then pick the style you will actually fasten completely every shift. NKE Safety Apparel's FR shirts collection includes these options:
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Snap front: the NKE FR Edge Ripstop Snap Shirt (6.5 oz 100% cotton ripstop; navy, khaki and grey) and the NKE FR Eagle Crest Work Snap Shirt (6.5 oz 100% cotton ripstop). Snaps are quick to close at the start of a shift, which helps full fastening become routine.
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Button front: the NKE FR Shield Work Button Shirt (6.5 oz 100% cotton ripstop). Not sure which closure suits your crew? Compare them in our guide to snap-front vs. button-front FR shirts.
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Base layer: the NKE FR Baselayer Tee (5.5 oz modacrylic-blend knit with spandex) for the layer next to skin. Confirm the combination meets your site's policy.
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High visibility: the NKE FR Hi-Vis Button-Down Shirt (6.5 oz modacrylic-blend ripstop) for crews that need FR and visibility in one garment. Check the product page for the hi-vis class and standards before you order.
A tucked shirt needs matching bottoms, so pair it with NKE FR pants, and add FR outerwear when you need a warm layer that is FR too. Women's sizing and cuts are in the women's FR collection.
Certifications and ratings differ from style to style. Read the label and product page for the standards your site's hazard assessment calls for before you order.
Who is responsible for showing you how to wear it
OSHA's PPE standard, 1910.132(f), requires employers to train each worker who must wear PPE on when it is needed, what is needed, how to put on, take off, adjust and wear it, what its limits are, and how to care for it, including its useful life and disposal. If nobody has walked you through how this shirt should be worn, ask your supervisor or safety lead. It is a reasonable question and a required part of the program.
Keep it ready between shifts
Follow the care label, and retire the shirt when it shows damage, not on a calendar. Our guides on signs your FR shirts have stopped protecting you and when to replace FR clothing cover what to look for.
The short version
The fabric does half the job and the way you wear it does the rest. Read the label, inspect, check your under-layers, fasten everything, tuck in and keep FR on the outside. It takes about two minutes, and it is the cheapest safety step on the job.
Ready to outfit yourself or your crew? Browse NKE Safety Apparel's FR shirts, pair them with FR pants, and if you are ordering for a team, take a look at the distributor program or email Onlinestore@nkesafetyapparel.com.
FAQs
1. Do FR shirts have to be tucked in? For electrical work covered by NFPA 70E, the clothing guidelines call for the shirt to be tucked into the pants and the sleeves fastened at the wrists. For other work, follow the garment manufacturer's instructions and your employer's FR program. Tucking in is the safe default either way.
2. Can you roll up the sleeves of an FR shirt when it's hot? No. Flame-resistant clothing protects only the skin it covers, so rolled sleeves leave your forearms unprotected. Use lighter-weight FR fabric and your site's heat-control steps instead.
3. What can you wear under an FR shirt? Wear an FR base layer or a natural fiber such as cotton, and avoid synthetics such as polyester or nylon that can melt against skin. Your employer's policy has the final word on under-layers.
4. How should an FR shirt fit? Comfortably loose enough to leave an air gap between fabric and skin, and snug enough that it stays tucked and does not snag. If it restricts reaching or bending, it is the wrong size or cut.
5. Can you wear an FR shirt that has oil or grease on it? Not if flammable residue remains. Oil, grease and fuel can ignite even when the fabric itself is flame resistant. Launder it per the care label, and retire it if the residue won't come out.
6. How often should you inspect an FR shirt? Look it over before each shift for holes, burns, thin spots, seam damage and broken closures, and again after laundering. Your site's program may set its own inspection schedule.
7. Does an FR shirt protect bare arms, hands and neck? No. It protects the areas it covers and only while worn as designed. Exposed skin gets no protection, so use the gloves, face and neck protection your hazard assessment calls for.
