I'm not a fashion writer. I'm a quality and compliance manager at a technical textile manufacturer. I review roughly 200 fabric submissions a year, and I've rejected enough first-round samples to know that the label is not always the truth—about 14% of the submissions I audited in 2024 had fiber-content or naming issues. This FAQ covers the Polartec-adjacent questions I keep getting from buyers, product developers, and people who just want to know if their hoodie is what it says it is. Jump to whatever one is yours:
- What exactly is “Polartec”?
- Is ECWCS Polartec the same as regular Polartec?
- What's a good Aritzia “Polartec fleece dupe”?
- Does the green Denim Tears hoodie use Polartec?
- Can you get pink acrylic paint out of Polartec fleece?
- Is rayon made from cotton?
- Should I trust a cheap “Polartec” deal online?
What exactly is “Polartec”?
“Polartec” is a brand of performance knit fabrics, not a generic word for fleece. It covers a lot of different constructions: Power Dry, Power Stretch, Power Shield, Thermal Pro, Alpha, and the older Polartec 100/200/300 series. When a garment label says “Polartec,” it means the fabric was manufactured to Polartec's specifications, not just that it feels soft and fuzzy.
What most people don't realize is that fleece is a structure, not a fiber. A cheap fashion hoodie and a Polartec technical fleece can both be polyester, but the knitting pattern, brushing, and finishing are completely different. That's why I tell buyers to ask for the exact style name. If the tag just says “polyester fleece,” you're not getting Polartec—and that might be perfectly fine, just don't pay a Polartec price.
Is ECWCS Polartec the same as regular Polartec?
ECWCS stands for Extended Cold Weather Clothing System. It's a military clothing system, not a fabric. In the Gen III system, some layers use Polartec. The Level 2 grid fleece is usually Polartec Power Dry, and other layers may use Polartec Power Stretch or Power Shield. But the system also uses materials that are not Polartec, so “ECWCS Polartec” describes a specific issued item, not a category.
The “all ECWCS fleece is Polartec” idea probably comes from the earlier Gen II era, when the system had fewer layers. In a Q1 2024 audit of surplus lots, I saw a mix: Polartec Power Dry in the Level 2 pieces, and unbranded polyester fleece in some other items. The real difference you're paying for in military Polartec is often the NIR finish, which reduces visibility under night vision. If you're buying surplus, trust the label, not the color.
What's a good Aritzia “Polartec fleece dupe”?
Reality check: Aritzia's Cozy Fleece line is not made with Polartec. It's a fashion fleece with a heavy drape and an oversized fit—basically the opposite of a performance knit. So the phrase “Aritzia Polartec fleece dupe” is a bit mixed up: if you want the Aritzia look, any thick brushed-back fleece hoodie will do; if you want Polartec, you want a technical garment, not a dupe.
Honestly, if it's the Aritzia silhouette you're after, buy the less expensive version and accept that it will probably pill faster. If it's actual Polartec you want, look for outdoor brands that use Polartec 200 or Thermal Pro. Used Mountain Hardwear or The North Face fleeces can be found cheaper than a new Aritzia hoodie, and the label will tell you exactly what the fabric is. That's a much better bet than a generic “fleece” with a trendy name.
Does the green Denim Tears hoodie use Polartec?
Not every Denim Tears hoodie uses Polartec. Denim Tears is best known for heavyweight cotton fleece hoodies with graphic prints—the kind of dense, soft cotton that fades with washing. That's not a performance fabric. If someone is selling a “green Denim Tears hoodie” and it's one of those cotton pieces, the only thing green is the color.
Denim Tears has done seasonal technical pieces and collaborations, so I'm not going to pretend I know every style in the 2025 catalog. The rule I use is simple: if a garment is made with Polartec, the label says “Polartec” and usually includes the fabric family. If the label says “100% cotton” or doesn't mention Polartec at all, you're buying a cotton hoodie with a name. That's not automatically bad—just know what you're paying for.
Can you get pink acrylic paint out of Polartec fleece?
Maybe. The first thing to know is that acrylic paint is basically liquid plastic. Once it dries, it forms a film on top of the fabric. Because Polartec is a polyester knit, it doesn't absorb water the way cotton does, so the paint tends to sit on the surface instead of soaking in. That's the good news.
Let the paint dry completely, then flex and roll the fabric to crack the film off. For the remaining pink stain, blot with a cotton swab dipped in 70% isopropyl alcohol—don't scrub—then rinse and machine wash. Avoid acetone or nail polish remover; acetone can melt polyester fleece. And test the alcohol on an inside seam first, because fabrics are dyed differently. If the fabric is a high-loft style like Thermal Pro, be gentle or you'll crush the nap.
Is rayon made from cotton?
No, not in the way most people mean. Rayon is a manufactured fiber made from regenerated cellulose. The cellulose usually comes from wood pulp, but it can also come from cotton linters—the short fibers left over after ginning. Even when cotton linters are the starting material, the chemical process changes the fiber completely. The result is rayon, not cotton.
That's why U.S. fiber labeling law is strict. Per the FTC's Textile Fiber Products Identification Act (15 U.S.C. §70) and the rules at 16 CFR Part 303, labels must use generic fiber names. “Cotton” is a natural seed hair fiber; “rayon” is the generic name for regenerated cellulose. A garment labeled “100% rayon” contains no cotton. If it's a blend, the label will say something like “60% cotton / 40% rayon.” If a supplier tells you “it's basically cotton,” walk away.
FTC fiber labeling rules, 16 CFR Part 303: textile labels must identify each fiber by its generic name. Rayon is not cotton, even if the cellulose source was a cotton byproduct.
Should I trust a cheap “Polartec” deal online?
Only if the seller shows you the actual label. I keep seeing product descriptions that say “Polartec style fleece” or “Polartec-like.” Those words mean the item is not Polartec. Genuine Polartec garments carry a Polartec tag or a content label that names the fabric family—something like “Polartec 200” or “Polartec Power Stretch.”
Here's something vendors won't tell you: if you ask for a photo of the care label and they go quiet, that's your answer. A transparent seller will tell you exactly which Polartec construction it is and why it costs what it costs. They'll also be okay with you asking for the fabric weight, face fiber, and backer construction. If they can't answer those, you're not getting a technical fabric—you're getting a buzzword. Don't pay for a name that isn't on the label.