Materials 101
Petroleum-derived, non-biodegradable, and woven into most of what hangs on store racks today. Here is what each one is, how it is made, and what it costs.
Petroleum-Based Synthetic
The foundation of the modern clothing market is petroleum-based synthetic fibers. They dominate global fashion because they’re cheap to produce, not because they’re better for you. Worn against your skin for hours every day, these fabrics trap heat, hold odor, and shed microscopic plastic particles. Those same microplastics have now been found in human blood, lung tissue, and even the placenta.
Key concerns
Polyethylene terephthalate (PET) — the same polymer used to make plastic water bottles — spun into fiber and woven into fabric. First developed in the 1940s, polyester now accounts for roughly 60% of global fiber output, making it the single most produced textile material on earth. It is durable, wrinkle-resistant, and cheap to manufacture, which has made it the industry default across nearly every clothing category.
Key concerns
Also called Polyamide
The world’s first fully synthetic fiber, developed by DuPont in 1935 as a replacement for silk in women’s hosiery. Made from polyamide polymers derived from petroleum, nylon is prized for its tensile strength, light weight, and abrasion resistance. Today it is used heavily in activewear, swimwear, hosiery, and outerwear.
Key concerns
Made from polyacrylonitrile, acrylic dominates as a cheap substitute for wool in mass-market knitwear, sweaters, and fleece. Soft in hand but fundamentally different in behavior. Acrylic pills aggressively, fails to regulate body temperature, and researchers consistently identify it as one of the most environmentally damaging fibers in global circulation.
Key concerns
Produced from propylene, a byproduct of petroleum and natural gas refining, polypropylene is used primarily in performance base layers, athletic socks, and moisture-wicking underlayers. Because it is fully hydrophobic, it absorbs no water, which is marketed as a moisture-management advantage. In practice, sweat is displaced from the fiber surface but odor compounds accumulate rapidly, and the fiber cannot tolerate the high wash temperatures needed to fully clean it.
Key concerns
Petroleum-Based Synthetic
One fiber, three names. Blended into nearly every category of modern clothing in small quantities, where it quietly disqualifies them from natural fiber standards.
Also known as Spandex and Lycra — all the same polyurethane fiber
A polyurethane-based synthetic derived from petroleum, elastane can stretch up to 600% of its length and return fully to shape, resulting in the industry blending it into nearly everything. At just 2–5% by weight, it found its way into denim, underwear, socks, dress shirts, knitwear, and activewear, often with little consideration for the consequences.
Key concerns
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