Truewerk Review: Never Wear Polyester Under Flame-Resistant Clothing

Heat is the most under-respected hazard in outdoor work, and the difference between heat exhaustion and heat stroke is the difference between a break and an ambulance. Heat exhaustion: heavy sweating, cold and clammy skin, a fast weak pulse, nausea, muscle cramps, tiredness, dizziness, headache. The person is still oriented. Move them to a cool place, loosen clothing, apply cool wet cloths, give sips of water, and stay with them. Seek medical attention if symptoms worsen, last more than an hour, or if the person is vomiting. Heat stroke — a medical emergency: a body temperature of 103°F or higher; hot, red skin that may be dry or damp; a fast strong pulse; headache; dizziness; nausea; and, critically, confusion, slurred speech, loss of coordination or loss of consciousness. Call 911 immediately. Move the person into shade or air conditioning and start cooling right away — cool water immersion where possible, or cool wet cloths and fanning. Cooling first, transport second, is what the evidence supports. Do not give fluids to someone who is confused or unconscious. Confusion is the single most important sign. A worker who becomes irritable, disoriented or stops making sense in the heat is not being difficult — that is heat stroke until proven otherwise. Prevention, which is where clothing genuinely contributes: Water, rest and shade. Drink small amounts frequently rather than large amounts occasionally — roughly a cup every 15 to 20 minutes in heat. Do not wait until you are thirsty. Acclimatisation is the most under-appreciated factor. New workers and those returning after time away are at markedly higher risk in their first days. Most heat fatalities occur in the first week on the job. Build exposure gradually. Light-coloured, loose, breathable, moisture-wicking clothing — which is precisely what this category of workwear is designed to do, and a real advantage over heavy cotton canvas. Schedule heavy work for cooler parts of the day and take breaks in shade. Watch each other. The person with heat stroke is the least able to recognise it. Know the risk multipliers: high humidity, direct sun, heavy PPE that blocks evaporation, certain medications including some blood pressure drugs, diuretics and antihistamines, alcohol the night before, and existing heart or kidney conditions. On sun protection, since this is a distinct product category here. Outdoor workers have substantially elevated cumulative UV exposure and elevated skin cancer risk. UPF is the fabric equivalent of SPF. UPF 50 means roughly 1/50th of UV passes through — about 2%. UPF 30 or above is considered good; 50+ is excellent. A sun hoodie is genuinely effective sun protection and it does not wash off or need reapplying, which is why it outperforms sunscreen for all-day work. Cover what you can with fabric; sunscreen the rest. Ordinary light cotton offers far less protection than people assume, and less again when wet or stretched. Do not neglect ears, neck, lips and the backs of hands, which are the commonest sites of work-related skin cancers. Check your skin. New or changing moles, a sore that will not heal within a few weeks, or a rough scaly patch on sun-exposed skin all need a doctor.

If your work requires protective clothing, the standard on the label is the specification. Everything else is comfort. Flame-resistant clothing. Two different hazards, two different standards. NFPA 2112 covers flame-resistant garments for protection against flash fire — common in oil and gas and chemical work. NFPA 70E governs electrical safety in the workplace and drives arc-rated clothing requirements. Arc rating is expressed in calories per square centimetre — ATPV or EBT. Your required rating comes from an arc flash risk assessment for the specific task, not from a general preference. Check what your employer's assessment specifies. All arc-rated clothing is flame resistant; not all flame-resistant clothing is arc rated. This distinction catches people out. And the rule at the top of this review, which is the most important thing here: never wear meltable synthetics under FR. Polyester, nylon, acetate and polypropylene melt and adhere to skin in a fire, causing severe burns that the FR outer layer cannot prevent. Base layers must be cotton, wool, or specifically FR-rated. This includes underwear and socks. A great deal of ordinary athletic and moisture-wicking clothing is polyester — check the composition label rather than assuming. FR garments must be worn correctly to work: sleeves down, collar closed, fully fastened, and long enough that no skin or non-FR layer is exposed at the waist or wrists. Wash FR clothing per the manufacturer's instructions. Fabric softener, bleach and starch can compromise flame resistance, and heavy contamination with flammable substances such as oils and solvents defeats it entirely. A contaminated FR garment is not FR. Inspect and retire damaged garments. Holes, thin patches and worn seams are failure points. High-visibility clothing. The governing standard in the US is ANSI/ISEA 107. It defines performance classes based on the amount of background and retroreflective material. Class 1 — minimum coverage, for low-risk environments well away from traffic. Class 2 — for workers near roadways with traffic generally under about 50 mph, or in complex backgrounds. Class 3 — the highest, for high-speed traffic environments and poor visibility, with sleeves included so the wearer's movement is visible. Class E — supplemental items such as trousers, which combine with Class 2 or 3 tops to make a Class 3 ensemble. Types R, O and P — roadway, off-road and public safety. Federal rules require high-visibility apparel for workers exposed to traffic on federal-aid highways, and many employers and jurisdictions require it more broadly. Check what your site requires. Hi-vis only works if it is clean and undamaged. Dirt, fading and worn retroreflective tape substantially reduce visibility, and a filthy vest is close to useless at night. Wash it and retire it when the reflective material dulls. A practical point on buying: a garment that is comfortable gets worn, and PPE that is not worn protects nobody. That is the honest argument for spending more on workwear — the technical fabrics here are more comfortable in heat than traditional canvas, and comfort drives compliance. Just make sure the garment carries the standard your work actually requires, and that any base layer underneath is compatible.

On price and value. Pants from $79 to $149 and shirts from $39 to $79 is upper-mid-market for workwear — meaningfully above basic cotton duck, below the most specialised technical PPE. Judge on cost per wear. A $99 pant worn four days a week for two years is pennies a day; the same pant worn occasionally is not good value. Trade workers who wear the same category of garment daily are the audience where this maths works, and it works well. What you are paying for, honestly: stretch and articulation, which genuinely reduce the fatigue of squatting, kneeling and climbing all day; moisture management, which matters in heat; lighter weight; and a fit designed around movement rather than around a rectangle of fabric. What you may be giving up: raw abrasion resistance. Lighter technical fabrics generally do not outlast heavy cotton duck against sustained abrasion — dragging across concrete, roofing, or heavy welding spatter. For the most abrasive trades, a heavier fabric may still be the right choice, and for hot-work environments FR requirements decide it anyway. Practical buying points: Check the knee pad system if you kneel for work. Built-in knee pad pockets are a genuine health feature — kneeling work is associated with prepatellar bursitis and knee osteoarthritis, and pads meaningfully reduce the load. Check the pads are included or budget for them, and that they sit correctly when you actually kneel rather than when you stand. Check pocket layout against your tools. A phone pocket that dumps your phone when you kneel is a daily annoyance. Confirm sizing and inseam options, and try a garment through the movements you actually make — squat, kneel, reach overhead — rather than standing in front of a mirror. Confirm the returns window and who pays return shipping before ordering, since we could not verify those terms. Free shipping over $100 is easy to clear at these prices; returns are the term that matters for a first order. Buy one before buying five. Fit is the whole question in workwear, and brands differ enormously. Two further health notes for people who work in these clothes all day: Damp clothing in cold conditions is dangerous. Wet fabric conducts heat away from the body rapidly, which is why the layering principle is a wicking base, an insulating middle and a windproof shell — and why cotton is a poor base layer in the cold, though it remains the right choice under FR. Change out of sweat-soaked layers before a break in the cold, not after. Change out of damp workwear promptly at the end of a shift. Prolonged damp fabric against skin contributes to chafing, folliculitis and fungal infection, particularly in the groin and feet. And wash work clothing separately from household laundry where it is contaminated with chemicals, lead, silica or pesticides — take-home contamination is a documented route by which workers expose their families.

What does Truewerk cost? Verified August 13, 2026: WerkPants from $79 to $119, overalls with knee pads $149, shorts $69 to $79, tees $39 to $44, a sun hoodie $49, flannel $79 and WerkShirts $69 to $74, with free shipping over $100 and a promotion of up to 25% off. Can I wear a polyester base layer under FR clothing? No. Meltable synthetics — polyester, nylon, acetate, polypropylene — melt and adhere to skin in a fire. Base layers must be cotton, wool or FR-rated, and that includes underwear and socks. What is the difference between FR and arc-rated? All arc-rated clothing is flame resistant, but not all FR clothing is arc rated. NFPA 2112 addresses flash fire; arc ratings in cal/cm² come from an arc flash risk assessment under NFPA 70E. How do I wash FR clothing? Strictly per the manufacturer's instructions. Fabric softener, bleach and starch can compromise flame resistance, and contamination with oils or solvents defeats it. Which hi-vis class do I need? ANSI/ISEA 107 defines the classes. Class 1 for low-risk areas away from traffic; Class 2 near roadways with traffic generally under about 50 mph; Class 3 for high-speed or poor-visibility environments. Check what your site requires. Does hi-vis wear out? Yes. Dirt, fading and worn retroreflective tape substantially reduce visibility. Wash it and retire it when the reflective material dulls. What does UPF 50 mean? Roughly 1/50th of UV passes through the fabric — about 2%. UPF 30 or above is good, 50+ excellent. A sun hoodie is effective all-day protection that does not need reapplying. How do I tell heat exhaustion from heat stroke? Mental state. Heat exhaustion leaves someone oriented with cool clammy skin; heat stroke brings confusion, slurred speech or unconsciousness with hot skin and a temperature of 103°F or above. Heat stroke is a 911 call, and cooling starts immediately. Who is most at risk of heat illness? New workers and those returning after time away — most heat fatalities occur in the first week, before acclimatisation. Build exposure gradually. Is technical fabric as durable as cotton duck? Generally less abrasion-resistant. For the most abrasive trades, heavier fabric may still be right; for heat and mobility, technical fabric wins. Should I wash work clothes with household laundry? Not if they are contaminated with chemicals, lead, silica or pesticides. Take-home contamination is a documented route by which workers expose their families.