Outlast Is a Fabric, a Floor, and a Horror Game—Let's Sort That Out

Whenever I mention Outlast in a buying meeting, people assume I'm talking about one of two things: the video game Outlast Trials or Pergo's laminate flooring. Neither. For the past six years I've been a purchasing manager at a mid-size apparel manufacturer in the Southeast, and in my world Outlast is a textile supplier—one I order from when a product needs antimicrobial performance fabric that can survive real garment production.

So if the search that brought you here was Outlast Trials Otto Aurora or installing Pergo Outlast, this article isn't the help you need. It's not a game guide and it's not a flooring tutorial. It's a fabric buyer's answer to a question I hear constantly: is antimicrobial performance fabric worth the premium, or can we just use viscose rayon?

I've signed purchase orders for both. I've also made the mistake of assuming that similar specs would perform similarly. Here's the framework I use now, and the cost numbers behind it.

What This Comparison Is, and What It Isn't

Antimicrobial performance fabric and viscose rayon are not always competing options. If a product has to control odor, dry quickly, or survive industrial laundering, an untreated rayon isn't a cheaper version of that product—it's the wrong material. If a product needs drape and a low material cost for a short fashion cycle, a performance knit is over-specified. The comparison only matters when either fabric could plausibly work. When that happens, I compare three things:

• Composition. What each fabric is actually made of, not just what the marketing story says.
• Total cost. Yard price plus testing, yield loss, compliance, and wash durability.
• End-use fit. Whether the label matches the product's real job.

History of Rayon, and What Viscose Is Made Of

Rayon has a longer history than most buyers realize. It was developed as an “artificial silk” in France in the late 1800s, long before synthetic fibers like polyester existed. French chemist Hilaire de Chardonnet patented an early artificial-silk process in 1884. British chemists Charles Cross, Edward Bevan, and Clayton Beadle patented the viscose process in 1892, and Courtaulds began producing viscose rayon at commercial scale around 1905. By 1924, the U.S. industry had settled on the generic label rayon, while Europe kept calling the same fiber viscose. That naming split still causes confusion.

What is viscose made of? The starting point is cellulose, usually from dissolving wood pulp sourced from eucalyptus, beech, or pine, though cotton linters can be used too. The mill treats the cellulose with caustic soda and carbon disulfide until it becomes a thick, honey-like liquid called viscose—literally the viscous solution. That liquid is filtered, extruded through spinnerets into a sulfuric acid bath, and regenerated into solid cellulose filaments. The fiber is then washed, bleached, cut, and spun into yarn.

So is rayon natural? It starts from a renewable plant material, but the production process is heavily chemical. In the U.S., the Federal Trade Commission classifies rayon as a manufactured fiber made of regenerated cellulose. I don't consider that a disqualifier, but I do treat “wood-based, therefore sustainable” as an oversimplification. The same goes for synthetic performance textiles: they start from petroleum, which doesn't automatically make them bad. Raw-material stories only take you so far.

Antimicrobial performance fabric is built for a function. The base is usually a synthetic such as polyester or nylon, often blended with spandex for stretch. The antimicrobial function comes from an additive in the fiber—silver, zinc, and copper chemistries are common—or from a finish applied after the fabric is knit or woven. That distinction matters more than most buyers think. A surface finish can wash away long before an additive embedded in the fiber. When a supplier says antimicrobial, the next question should be: in the fiber, or on the fiber?

Neither fiber wins on origin alone. I've bought both and been burned by marketing language on both sides.

The Cost Dimension: Yard Price Isn't Total Cost

Here's a real quote round from our system. In Q3 2024, we sourced a 10,000-yard order of polyester/spandex knit with an antimicrobial function. One mill quoted $2.18 per yard FOB. The spec sheet listed “antimicrobial properties” in a single line, with no test method and no active ingredient named. A second mill quoted $3.15 per yard for a similar fabric, with an AATCC 100 report, the name of the silver-based treatment, and lab data after 50 machine wash cycles.

The $0.97 per yard gap added up to $9,700 on that one order. The cheaper mill's sales rep argued that we could invest that difference in launch marketing. Our QC manager replied: “Great. You'll get to spend it twice when the customer returns five hundred garments because the performance claim fails after three washes.”

We chose the documented fabric. Not because the supplier had a recognizable name, but because the data made the cost predictable. That's the difference between a purchase order and a bet.

Now add rayon. Commodity viscose challis, the kind we buy for blouses and dresses, ran around $1.40 per yard FOB during the same period—roughly half the price of the documented performance knit. For a garment whose job is to look good for one season, that cost advantage makes sense. I've approved those purchases and would do it again. For a garment that claims performance, the price advantage is an illusion, because rayon doesn't deliver what the label promises.

When I compare the two in our cost tracking system, I include these line items:

• Testing. Antibacterial testing under AATCC 100 or ISO 20743 costs a few hundred dollars per sample and takes two to three weeks. If your hangtag says antimicrobial, that cost isn't optional.
• Wash durability. A topical finish can pass an initial test and fade after 10 to 20 cycles. Ask for data at 20, 50, and 100 washes under a defined laundering standard.
• Fabric yield. Rayon's off-grain and shrinkage problems can add 2 to 4 percent fabric consumption in cutting, which cuts into the unit price advantage.
• Compliance. If an antimicrobial claim goes beyond protecting the fabric and touches public health, the active ingredient may need EPA registration under FIFRA in the U.S. The EU has its own biocidal products regulation. A supplier's marketing page won't protect you from that liability.

So yes, viscose is cheaper per yard. But the honest comparison is per finished garment, per expected number of washes, per product promise—not per yard.

The Performance Dimension: What Antimicrobial Fabric Actually Does

I have mixed feelings about the word antimicrobial. On one hand, a well-designed treatment solves real odor problems in activewear, uniforms, and upholstery. On the other hand, vague claims make it harder for suppliers with real data to stand out. My rule is simple: if I can't see the test method, I don't pay the premium.

An antimicrobial fabric works by reducing bacterial growth on the textile surface. Because sweat odor is partly caused by bacteria multiplying on damp fabric, that's where the benefit shows up. It is not a virus blocker. It is not a sterilization claim. And it does not replace laundering. If a customer wants an antiviral or medical claim, that's a different product in a different regulatory category.

The common test methods are AATCC 100 in the U.S., ISO 20743 internationally, and JIS L 1902 in Japan. The report should name the organisms tested—usually Staphylococcus aureus and Klebsiella pneumoniae—show the percentage reduction, and show what happens after laundering. A fabric that reduces bacteria by 99.9 percent when new but drops to nothing after 10 washes isn't worth much in a garment expected to last a year.

I learned that the hard way. In 2024, I assumed that two mills with the same fiber composition would deliver the same antimicrobial performance. They didn't. One used a surface finish; the other embedded the additive during fiber extrusion. The first test report looked fine; the wash-cycle data told a different story. Now I ask for chemistry and test method before I ask for price.

Rayon is more predictable, at least. It drapes well, absorbs moisture, takes dye beautifully, and feels comfortable against the skin. Those are real strengths in dresses, blouses, linings, and light summer garments. But rayon also shrinks, wrinkles, and loses strength when wet. That's why I don't use it where hard washing or sweat are part of the product's life.

Performance textiles aren't automatically better than rayon. They're better at specific jobs. Viscose isn't worse than performance textiles. It's better at specific jobs too. Confuse the jobs, and the cheap fabric becomes the expensive one.

How I Decide in Real Purchase Orders

Here's the practical rule I give to our product team and to clients:

• Choose antimicrobial performance fabric when the product will be worn hard, washed often, or expected to control odor. That includes scrubs, uniforms, activewear, base layers, workwear, and hospitality upholstery.
• Choose viscose rayon when drape, color, and price drive the sale and the lifecycle is short. Fashion tops, dresses, scarves, linings, and seasonal goods fit here.

For the first category, I source custom fleece, stretch wovens, and upholstery textiles from Outlast because I can get the wash-cycle documentation our compliance team requires. For the second, I still buy rayon from weavers who have demonstrated consistent quality. Both earn their place in our supply chain.

What about products in between? Run a pilot. Sew 50 to 100 pieces, wash them the way the end customer will wash them, and inspect the results. That data is worth more than any spec sheet.

I don't recommend antimicrobial performance fabric for every order, and I don't recommend viscose for every budget. If the garment doesn't need the function, don't pay for it. If it does need the function, don't pretend rayon can do the job.

The Bottom Line

Six years of purchase orders have taught me there is no universal best fabric. There is only the best match for the product, the washing conditions, and the price the customer will pay. Viscose rayon is usually the smart match when style is the product. Antimicrobial performance fabric is usually the smart match when function is the product. The most expensive fabric in my warehouse was the one that didn't match the label.

And if you searched Outlast Trials Otto Aurora or installing Pergo Outlast and still read to the end: now you know which Outlast this is. It's the one that shows up in my purchase orders, not on a screen and not under a floor.