Why do I refuse to wear clothing made from polyester?

¿Por qué me rehuso a usar ropa fabricada con poliester?

    Why do I refuse to wear polyester clothing?

    I refuse to wear polyester clothing every day because my body notices the difference before my mirror does. Polyester is plastic in fiber form. It doesn't breathe like a natural fiber; it traps heat and moisture, retains odor-causing bacteria, and requires dyes and finishes that irritate sensitive skin. With every wash, it releases microfibers that end up in the air of your home, in the water, and, according to recent studies, in blood and filtering organs. Understanding this changed how I dress.

    In this article, I explain what polyester is, what dermatology says about irritation and dyes, why synthetic sportswear smells more after a workout, what we know about microplastics in the human body, and what I use instead with fibers that care for your skin. Everything is based on traceable evidence and without alarmism.

    RESTLESS HIGH QUALITY NYLON ACTIVEWEAR SET WOMEN<!--nl--><!--nl-->RESTLESS high-quality women's sportswear <!--nl--><!--nl-->NYLON NATURAL FABRICS|Color:JOY

    Photo taken from RESTLESS, 100% organic materials.

    What polyester really is and why it's in everything

    Polyester is polyethylene terephthalate, or PET, the same material found in plastic bottles. From an industrial standpoint, it is nearly perfect: cheap to produce, durable, wrinkle-resistant, and quick-drying.

    That advantage explains its dominance. According to the Textile Exchange in its 2025 Materials Market Report, 132 million tons of fiber were produced worldwide in 2024, with 59% consisting of polyester, and 88% being fossil-based virgin material. Textile-to-textile recycling remains below 1% of the total. Cotton accounts for about 19%. The fibers we consider true luxury—natural and organic—represent a tiny fraction.

    Choosing a different fiber costs more. That cost is the foundation of my decision.

    How does your skin feel when wearing polyester all day?

    It doesn't absorb, it traps: moisture, heat, and friction

    Polyester is hydrophobic. It does not absorb sweat like cotton or linen. The sweat stays between your skin and the fabric, creating a warm and damp microclimate. This environment encourages bacterial growth and friction.

    Textile microbiome studies show that polyester promotes odor-causing bacteria. A study by Callewaert and colleagues in Ghent, published in Applied and Environmental Microbiology, found that polyester selectively promotes Micrococcus, which is associated with bad odor after training. Dermatology describes the same mechanism: since it doesn't allow for evaporation, polyester acts as a sauna suit that irritates areas of close friction such as the neck, waist, armpits, and groin.

    Irritation often comes from the dye, not the plastic itself

    The base polymer PET is chemically inert and essentially non-allergenic. Textile contact dermatitis associated with polyester comes largely from the disperse dyes needed to color it under high temperature and pressure.

    Dermatological literature identifies Disperse Blue 106 and Disperse Blue 124 as frequent causes of allergic contact dermatitis from clothing. A classic review in the Journal of the American Academy of Dermatology already identified them as primary allergens, and subsequent studies in the American Journal of Contact Dermatitis recommend them as screening allergens. These molecules are small and lipophilic; they migrate with heat and sweat and remain in prolonged contact with the skin. Dermatologists often recommend natural fibers for patients with dermatitis for this reason.

    This does not mean that every polyester garment causes a reaction. It means that if your skin is sensitive, the risk increases, and the location usually coincides with a tight fit.

    Microplastics: what your clothes shed and where they have been found

    Each wash releases hundreds of thousands of fibers

    Every wash of polyester releases microfibers into the water. A 2016 University of Plymouth study measured about 496,000 fibers per 6 kg wash of polyester, with higher ranges for acrylic and fleece. Other work reports between 700,000 and more than 1.5 million depending on the weave and temperature. These fibers pass through household filters and treatment plants, reaching rivers, oceans, household dust, and indoor air. When drying, a portion becomes airborne and you breathe it at home. This point is documented by the Plastic Pollution Coalition and NonToxicLab in their guides on synthetic fibers.

    Microplastics in blood, liver, kidneys, and brain: what it means and what it doesn't mean

    The question is no longer whether microplastics reach internal organs. The evidence shows that they do.

    In March 2022, a team at Vrije Universiteit Amsterdam led by Heather Leslie published the first quantification of plastic in human blood in Environment International: particles were detectable in 17 out of 22 healthy donors (77%), with an average of 1.6 micrograms per milliliter, including PET. Since then, they have been reported in the placenta, breast milk, lungs, liver, and kidneys.

    Two tissue studies are key. Horvatits and colleagues in eBioMedicine 2022 detected polymers in cirrhotic livers, with no findings in healthy livers in that small series. A 2025 study in Nature Medicine led by the University of New Mexico measured microplastics and nanoplastics in the liver, kidney, and brain—mostly polyethylene—with higher concentrations in 2024 samples than in 2016. Plasticproof summarizes both findings and emphasizes that they measure exposure, not proven damage.

    The honest reading: detecting plastic in organs confirms that particles reach the filtration system. It does not prove that they cause disease in healthy people. The studies are small, observational, and post-mortem. Causality remains unestablished. That uncertainty goes in both directions. It does not justify panic, nor does it justify minimization.

    Sweat and skin absorption: what Birmingham showed

    A team from the University of Birmingham published experimental evidence in Environment International in 2024 showing that chemicals present as additives in microplastics can be released into sweat and absorbed through the skin. They used 3D human skin models and found that up to 8% of the exposed chemical could be absorbed in 24 hours, with greater absorption in hydrated or sweaty skin.

    That study investigated PBDE-type flame retardants, not all textile dyes. Even so, it establishes a mechanism relevant to tight-fitting sportswear worn during exercise, when sweat and temperature increase transfer from fabric to skin.

    Hormones and polyester: what the evidence says and doesn't say

    There is concern about endocrine disruptors associated with plastics, such as phthalates, bisphenols, and PBDEs. These compounds appear as plasticizers, flame retardants, or finishes in some textiles and environmental microplastics. Their hormonal effect is documented in other exposure contexts.

    There is no direct evidence that polyester as a base polymer alters hormones simply by wearing it. Claims citing silent infertility due to genital contact with polyester are based on an old study in an animal model with prolonged and direct exposure, PMID 8279095, which is not extrapolatable to everyday use of t-shirts or leggings. There is no solid evidence that wearing polyester causes cancer through textile contact. There is evidence that some finishes like formaldehyde, certain disperse dyes, and PFAS coatings are irritants or carcinogens classified in other exposure scenarios. The reasonable concern is cumulative chemical load, not an acute dose from a single garment.

    Distinguishing polymer from additive is essential for making decisions without falling into fear.

    What I do and what you can do without going to extremes

    I don't propose throwing away your entire closet. I propose prioritizing where exposure is greatest.

    1. Wash new clothes before wearing them. It reduces loose dye and first-use finishes.
    2. Prioritize natural fibers for prolonged contact: underwear, pajamas, base layers, bed sheets, and baby clothes. That is where you spend 6 to 8 hours straight in contact.
    3. If you use polyester, choose light colors when you can. Dark disperse dyes, blue 106 and 124, are the most reported sensitizers.
    4. Use a microfiber capture bag like Guppyfriend. It doesn't catch everything, but it reduces what reaches the water.
    5. Ventilate and vacuum dust frequently. Synthetic fibers settle into household dust and are inhaled.
    6. Avoid anti-odor or antimicrobial treatments on polyester when possible. They add chemicals with marginal benefit.

    These actions are practical, low-effort, and aligned with what daily chemical exposure researchers like Philip Landrigan recommend: reduce avoidable load where you don't sacrifice performance.

    Why at RESTLESS we chose LUXEmotion, COMPACTluxe, and DIAMONDsoft

    At RESTLESS, we work 100% with organic materials because we understand that luxury is what touches your skin all day. Luxury is a brand that decides to pay more for a fabric that takes care of you, even if it lowers its margin. That decision isn't seen in a photo. It is felt at 6:00 PM.

    Our three base fabrics follow that logic:

    DIAMONDsoft is Peruvian pima cotton. Extra-long fiber, soft, breathable, and stable. It is one of the safest fibers for sensitive skin and prolonged use. We blend it with Colombian cotton to support local production.

    COMPACTluxe brings together organic fibers with a structural support. It supports without squeezing, doesn't trap moisture, keeps its shape, and allows for evaporation. Designed for daily use and movement.

    LUXEmotion is our high-performance organic fiber with a luxurious feel. Designed for leggings and tops you need to wear for hours—to train, work, and live in—without itching, trapped heat, or lingering odor. Softness that lasts wash after wash.

    Every choice makes production more expensive and slower. That is why almost no one does it 100% organic. We do it because we understand it's not just about skin. It is about daily health and real comfort. RESTLESS is with you, not against you.

    7. References


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