Manufactured fibers are any textile fibers that don’t exist in nature as fibers and instead require human processing to create. They’re made from either petroleum-based chemicals or natural raw materials like wood pulp, but in both cases, the fiber itself is formed by pushing a liquid through tiny holes (called a spinneret) and solidifying it into strands. Synthetic fibers now account for nearly three quarters of global fiber production, up from 45% in 1996, and man-made fibers surpassed cotton in traded value for the first time in 2023.
Two Main Categories: Regenerated and Synthetic
Manufactured fibers split into two broad families based on where their raw material comes from. Understanding this distinction matters because it affects everything from how the fabric feels against your skin to how it behaves in a landfill.
Regenerated fibers start with a natural material, usually cellulose from wood pulp or cotton waste. That cellulose is dissolved using chemicals, then reformed into fiber. The result is something that didn’t exist as a fiber in nature but is built from natural building blocks. Rayon, lyocell, and acetate all fall into this category. Because they originate from plant cellulose, they tend to absorb moisture and drape more like natural fabrics.
Synthetic fibers are built entirely from chemical compounds, most derived from petroleum. The polymer chains are created through chemical reactions, then spun into fiber. Polyester, nylon, acrylic, and spandex are the most common examples. These fibers generally absorb very little water. Polyester, for instance, has a moisture regain of just 0.4%, which is why polyester shirts can feel clammy in humid weather but dry quickly after a wash.
Common Regenerated Fibers
Rayon was the first commercially successful manufactured fiber and remains one of the most widely used regenerated options. It’s produced from wood pulp or cotton waste that’s chemically dissolved and then extruded into fiber. The result is soft, breathable, and takes dye well, which is why it shows up in everything from dresses to bedsheets.
Lyocell (often sold under the brand name TENCEL) uses a similar wood-pulp starting point but relies on a closed-loop solvent process that recovers and reuses more than 99% of the solvent. This makes it one of the more environmentally efficient regenerated fibers to produce. REFIBRA technology takes it a step further by combining wood pulp with upcycled cotton scraps.
Acetate is made from tree pulp treated with acids to modify the cellulose structure. It has a silky sheen and is commonly found in linings, blouses, and cigarette filters. A higher-acetylation version called triacetate offers better heat resistance and wrinkle recovery.
Common Synthetic Fibers
Polyester dominates the global textile market. It’s strong, wrinkle-resistant, holds its shape well, and is inexpensive to produce. You’ll find it in athletic wear, outerwear, upholstery, and blended with cotton in everyday clothing. Its main drawback is poor moisture absorption, which can make it uncomfortable in hot conditions unless the fabric is engineered with moisture-wicking textures.
Nylon was the first truly synthetic fiber and is prized for its exceptional strength and elasticity. It’s the go-to material for stockings, activewear, parachutes, and ropes. Nylon absorbs slightly more moisture than polyester, which gives it a marginally more comfortable feel against the skin.
Acrylic mimics the look and feel of wool at a lower price point. It’s lightweight, warm, and resistant to moths, which makes it popular for sweaters, blankets, and outdoor fabrics. Spandex (also called elastane) is the stretchy fiber blended into jeans, swimsuits, and yoga pants. Even a small percentage of spandex in a fabric blend gives it significant stretch and recovery.
How the Fibers Are Made
All manufactured fibers share the same basic concept: force a liquid through a spinneret (a plate full of tiny holes) and solidify the emerging strands into continuous filaments. The three main methods differ in how the liquid is created and how it solidifies.
- Melt spinning is the most common method. Polymer pellets are fed into a screw extruder, melted under pressure, and pushed through the spinneret. The strands cool in air or a water bath and solidify almost instantly. Polyester, nylon, and polypropylene are typically melt-spun. It’s the fastest and most economical approach.
- Dry spinning dissolves the polymer in a chemical solvent, pushes the solution through the spinneret, and then evaporates the solvent with hot air or gas. This is how most spandex fibers are produced.
- Wet spinning also uses a dissolved polymer, but the strands solidify by entering a chemical bath that causes them to coagulate. Rayon and acrylic are commonly wet-spun. This method dates back to the 1880s, when Joseph Swan injected dissolved cellulose into a coagulation bath to create filaments for light bulbs.
After spinning, filaments are typically drawn (stretched) to align the polymer chains, which increases strength. They may also be heat-set to lock in their structure and reduce shrinkage.
The FTC’s Official Fiber Names
In the United States, the Federal Trade Commission maintains a list of generic names that manufacturers must use on clothing labels. This is why your garment tag says “polyester” or “rayon” rather than a brand name. The FTC recognizes 25 generic manufactured fiber names, including polyester, nylon, rayon, acetate, acrylic, spandex, olefin, aramid, and glass. Lyocell is classified as a subtype of rayon, and triacetate falls under acetate. If you see “elasterell-p” or “triexta” on a label, those are specific subtypes of polyester with distinct stretch or stain-resistance properties.
Environmental Concerns
The biggest environmental issue with synthetic manufactured fibers is microplastic pollution. Every time you wash synthetic clothing, tiny fiber fragments break off and enter wastewater. Research published in PLOS One found that microfiber loss ranges from about 9 mg to over 1,200 mg per kilogram of textile per wash, releasing anywhere from roughly 8,800 to nearly 7 million individual microfibers in a single cycle. These fibers, primarily polyester, acrylic, polypropylene, and nylon, are now found throughout the marine environment.
Not all synthetics shed equally. Polyester fleeces and jerseys released about six times more microfibers (161 mg per kg per wash) than nylon fabrics with woven construction (27 mg per kg per wash). Fabrics that haven’t been mechanically brushed or napped shed significantly less, around 30 mg per kg per wash, compared to 204 mg for fleece. So the texture and construction of a garment matters as much as the fiber type.
Regenerated fibers like rayon and lyocell are cellulose-based and biodegrade more readily, but their production can involve harsh chemicals and significant water use. Lyocell’s closed-loop solvent recovery system is one industry response to that problem. On the synthetic side, polylactic acid (PLA) is the only bio-based synthetic polyester currently on the textile market. It’s made from plant sugars rather than petroleum and is biodegradable, though it still costs more and performs below conventional polyester in durability and heat resistance.
Skin Sensitivity and Chemical Finishes
Manufactured fibers themselves rarely cause allergic reactions. The more common culprit is the chemical finishes applied during production. Formaldehyde-based compounds, used to create wrinkle-resistant or “durable press” fabrics, are the most significant cause of textile-related contact dermatitis. Disperse dyes used to color synthetic fabrics can also trigger skin reactions in sensitive individuals. Washing new clothing before wearing it removes a portion of these surface chemicals and reduces the risk of irritation.