Synthetic clothing is any garment made from fibers produced in a factory rather than grown or harvested from nature. These fibers start as petroleum-based chemicals that are processed into long polymer strands, then spun into threads and woven or knit into fabric. Synthetic fibers now dominate the global textile market, accounting for nearly 73% of all fiber production worldwide as of 2023, up from 45% in 1996.
The Main Types of Synthetic Fiber
Three synthetic fibers make up the vast majority of what you’ll find on clothing labels: polyester, nylon, and acrylic. A few others, like spandex and olefin, fill specialized roles. Each is made from different chemical compounds and has distinct properties, but they all share a common origin in petroleum byproducts.
- Polyester is the most widely produced synthetic fiber in the world. It’s lightweight, wrinkle-resistant, and dries quickly. You’ll find it in everything from t-shirts to dress pants to athletic wear.
- Nylon was the first commercially viable synthetic fiber, introduced by DuPont in 1938 and sold nationally starting in May 1940. It’s strong, elastic, and abrasion-resistant, making it a staple in hosiery, activewear, and outerwear.
- Acrylic mimics the warmth and softness of wool. It’s commonly used in sweaters, blankets, and cold-weather accessories.
- Spandex (also sold under the brand name Lycra) is prized for its extreme stretch. It’s blended into jeans, leggings, and swimwear to add flexibility.
Most synthetic garments aren’t made from a single fiber. Blends are common: a cotton-polyester t-shirt, a nylon jacket with spandex for stretch, or an acrylic sweater reinforced with polyester for durability.
How Synthetic Fibers Are Made
The process begins with raw petroleum or petrochemical feedstocks. These are broken down into smaller chemical units called monomers, which are then linked together through a chemical reaction called polymerization to form long, chain-like molecules. The resulting polymer is melted or dissolved, then forced through tiny nozzles (a process called spinning) to create thin filaments. Those filaments are stretched, cooled, and twisted into yarn that can be woven or knit into fabric.
Additional chemical treatments are applied at various stages. Dyes give the fabric color, flame retardants reduce flammability (especially in children’s sleepwear), and various finishes can make the material water-resistant, anti-static, or softer to the touch.
Performance Compared to Natural Fibers
The practical advantage that made synthetics so popular is simple: they’re engineered for specific jobs. Polyester can move moisture away from your skin at rates three to five times faster than cotton. In standardized wicking tests, polyester pulls moisture upward 8 to 12 centimeters in ten minutes, while cotton manages only 2 to 4 centimeters. This is why nearly all athletic and outdoor clothing relies on synthetic fibers.
Drying time is where the gap gets dramatic. A wet cotton shirt can take four to six hours to dry at room temperature. A comparable polyester shirt dries in 30 to 60 minutes. Cotton absorbs water deep into its fiber walls, which also means it loses its ability to insulate when wet. Polyester doesn’t absorb water the same way, so it keeps performing in rain or heavy sweat.
Synthetics also resist wrinkles, stains, and pests like moths. They hold their shape well and tend to be more durable than natural fibers of the same weight. The trade-off is breathability: synthetic fabrics can trap heat and odor more than cotton or linen, though modern engineered knits have narrowed that gap considerably.
Chemical Exposure and Skin Concerns
Synthetic clothing contains chemical additives from manufacturing, particularly from the dyeing process. Disperse dyes used on polyester, various biocides, and flame retardants can remain in finished garments. Research has shown that some of these chemicals can migrate from fabric to skin. One study found that a flame retardant used in children’s sleepwear passed through the skin and was later detected in urine.
Benzothiazole, a chemical used in dyes and biocides, has been identified as a skin allergen. In one study, 17 out of 43 people developed a dermatitis reaction after topical exposure. That said, the calculated cancer risk from clothing-related exposure to this chemical falls below one in a million, which is within internationally accepted safety thresholds. For most people, the main concern is skin irritation or contact dermatitis rather than serious toxicity, and washing new garments before wearing them reduces chemical residue significantly.
Environmental Impact
The environmental cost of synthetic clothing centers on two issues: fossil fuel dependence and microplastic pollution. Every synthetic garment begins as petroleum, a nonrenewable resource. And every time you wash synthetic clothing, tiny plastic fibers break loose and flow into wastewater.
The scale of microfiber shedding varies widely depending on the fabric. Research published in PLOS One found that a single wash cycle can release anywhere from roughly 9,000 to nearly 7 million microfibers per kilogram of synthetic textile. Fleece and jersey-knit polyester are among the worst offenders, shedding about six times more microfibers than woven nylon. On average across all synthetic fabrics tested, each kilogram of clothing released about 514,000 microfibers per wash. These particles are too small for most wastewater treatment plants to fully capture, and they end up in rivers, oceans, and eventually the food chain.
Cotton’s share of global fiber production has dropped from nearly 40% to just 20% over the past three decades as synthetics have surged. Other natural fibers, both plant and animal-based, have fallen to around 7% of the market.
Recycled Synthetics
Recycled polyester, often labeled rPET, is made from post-consumer plastic bottles or discarded polyester garments. The environmental savings are substantial: producing recycled polyester uses 76% less energy, 20% less water, and generates 79% fewer carbon emissions compared to making virgin polyester from scratch. Many major clothing brands now incorporate rPET into their product lines, and it performs identically to virgin polyester in finished garments.
The limitation is that polyester can only be mechanically recycled a limited number of times before the fiber quality degrades. Chemical recycling methods that break polyester back down to its molecular building blocks are scaling up but remain a small fraction of total production.
How to Care for Synthetic Clothing
Synthetic garments are low-maintenance, but a few habits will extend their life and reduce microfiber pollution. Turn clothes inside out before washing so the outer surface avoids direct friction against other garments. Sort laundry by fabric type: heavier synthetics like fleece can damage lighter fabrics and shed more fibers in the process. Washing on a gentle cycle with cold water reduces both fiber breakage and energy use.
Pilling, those small fuzzy balls that form on the surface, is caused by friction during wear and washing. You can’t prevent it entirely, but sorting by fabric weight, using a mesh laundry bag, and avoiding high-heat drying all slow the process. A fabric shaver or sweater stone removes existing pills without damaging the garment. If you want to reduce microfiber pollution specifically, microfiber-catching laundry bags and in-line washing machine filters can trap a significant portion of the fibers before they reach the drain.