The Hidden Health Risks of
 Synthetic Fibers 

Reading time: 8 minutes
By Jordy Munarriz

Polyester, nylon, acrylic—these synthetic fibers are everywhere, from base layers to everyday essentials. Praised for their low cost and durability, they’ve become the default fabric for outdoor gear and modern wardrobes alike. But behind their “performance” promise lies a growing concern: these materials may be harming your health more than helping it.

Scientific studies now link synthetic textiles to a range of health issues—from respiratory damage to hormonal disruption. In this article, we dive into the latest research, highlight the risks of everyday exposure, and offer natural, performance-ready alternatives that protect both your body and the planet.

Inhaling Microfibers: How Synthetic Fibers Impact Your Lungs

Microplastic Inhalation and Lung Disease

Synthetic microfibers are no longer just an environmental issue. They're now considered a growing threat to human health, particularly through the air we breathe.

Once airborne, these microscopic fibers can be inhaled and settle deep within the lungs, where they may remain lodged for years. Research shows just how small these particles are: nylon microfibers as tiny as 12 × 31 μm and polyester fibers up to 15 × 52 μm have been detected floating in indoor environments [1][2].

This isn’t just theoretical. In a study of autopsies, 97% of lung tissue samples from patients with chronic respiratory disease were found to contain synthetic fibers [3].

And the danger isn’t limited to factories or high-exposure jobs. Everyday environments—our homes, closets, and laundry rooms—are part of the problem. A 15-minute cycle in a typical household dryer can release over 500,000 microfibers into the air [6]. Once suspended, they can linger in indoor spaces where most of us spend the majority of our time. In fact, indoor air has up to 8 times more microplastics than the outdoors [7].

Long-term exposure to these particles has been linked to reduced lung function, pulmonary fibrosis, and early-onset emphysema—especially in people with constant exposure, like textile workers, where 15–40% develop work-related respiratory illness [4][5].

At Arms of Andes, we believe performance wear shouldn’t compromise your breath. That’s why we make garments with 100% natural alpaca wool, a breathable fiber that doesn’t release plastic particles—so you can move freely without inhaling synthetic harm.

Cellular-Level Damage from Synthetic Textile Exposure

Studies using laboratory-grown “mini lungs” have shown that exposure to nylon microfibers disrupts the normal development of lung cells. This interference impairs the lungs’ ability to regenerate tissue after injury—a key function for anyone who values stamina, oxygen efficiency, or recovery after exertion [8].

Animal research further supports these findings. In one study, mice exposed to tire-derived microplastics developed fibrotic lesions and chronic lung inflammation, early indicators of interstitial lung disease, a group of conditions marked by progressive scarring and breathing difficulties [9].

More recent research (2024) has confirmed that continuous exposure to synthetic particles causes oxidative damage—an imbalance that stresses lung cells, damages DNA, and contributes to long-term respiratory decline [10].

6. Upgrade Your Hygiene and Cleaning Habits

Small changes to your personal care and cleaning routines can have a big impact:

• Switch to bamboo* toothbrushes: Look for ones with compostable bristles and packaging.
• Choose steel razors: A durable, waste-free alternative to disposable razors.
• Use natural options: Biodegradable shampoos, soaps, and detergents are better for the planet.
• Use menstrual cups and fabric sanitary towels: They take a little getting used to, but you won’t go back when you do!
• Clean with vinegar and baking soda: These simple ingredients work wonders around the house and are free of harmful chemicals [8].

* When choosing products made from bamboo, try to ensure the bamboo comes from sustainable sources.

7. Embrace Nature and DIY Solutions 

Spending time outdoors and trying DIY solutions are both fun and sustainable:

• Grow your own vegetables: Even a small herb garden on a windowsill can make a difference.
• Start composting: Turn food scraps into nutrient-rich compost for your garden. No garden? Check if your city collects food waste.
• Connect with nature: Spending time outside reduces stress and reminds us why protecting the planet matters.
• Join community initiatives: Participate in clean-ups or tree-planting events.

At Arms of Andes we make our gear from 100% Royal Alpaca Wool of 18-18.5 microns.

MIDWEIGHT HOODIEWomen's Alpaca Wool Joggers 300 Lightweight

Digestive Disruption: How Microplastics Travel Through Your Gut

Ingestion and Gastrointestinal Impact

Microplastics are no longer just a marine concern—they’ve become an inescapable part of our daily environment. These particles are now found in the air we breathe, the food we eat, and the water we drink, making accidental ingestion almost impossible to avoid [3].

Once inside the gastrointestinal tract, microplastics can do more than simply pass through. Research shows that they can trigger inflammation, oxidative stress, and disturb the gut microbiome—the vital ecosystem of bacteria that supports digestion, immunity, and overall well-being [3,11].

But the impact doesn’t stop there. A study published in Environmental Health Perspectives revealed that microplastics can translocate—moving from the gut into distant organs like the liver, kidneys, and even the brain [3,12]. This suggests a far-reaching, systemic exposure that affects more than just the digestive system.

If you're someone who values clean nutrition, gut balance, and high performance from the inside out, it’s worth considering that the fibers in your clothes may be adding more than comfort to your life. Wearing synthetic fabrics—especially next to the skin—can contribute to microplastic ingestion through fiber shedding, especially during physical activity.

Microplastics and Gut Microbiome Imbalance

The gut microbiome—a vast community of trillions of microorganisms living in the digestive tract—is central to human health. It helps regulate inflammation, process nutrients, support the immune system, and even influence mood and metabolism.

But this finely tuned ecosystem is highly sensitive to disruption.

Once ingested, these microscopic particles can disrupt the microbial balance of the gut, a condition known as dysbiosis [13]. When dysbiosis occurs, harmful bacteria begin to outcompete beneficial ones. This imbalance can weaken the gut’s ability to regulate key processes, leaving the body more vulnerable to inflammation, poor nutrient absorption, and weakened immune defense [14].

Over time, this disruption may contribute to chronic digestive conditions. In fact, studies have linked nylon fiber exposure to an increased risk of inflammatory bowel diseases like Crohn’s disease and ulcerative colitis [3].

While the connection between textiles and gut health may not be immediately obvious, it’s a reminder that the materials we live in daily have deeper consequences than surface comfort. Clothing isn't just a layer—it’s part of our exposure.

Colorectal Cancer and Microfiber Exposure

While research is still evolving, new studies are pointing to a concerning trend: a possible link between microplastic exposure and early-onset colorectal cancer (EOCRC) [15].

Scientists suggest that when microplastics are ingested, they may trigger chronic inflammation and damage the intestinal lining—conditions that create a favorable environment for cancer to develop [15]. This is particularly relevant as rates of EOCRC continue to rise globally, especially in younger populations.

Though a definitive causal relationship has not yet been confirmed, the findings are enough to raise red flags. They add to a growing body of evidence that microplastic exposure can have long-term consequences for digestive and overall health.

Skin Deep: Allergies, Infections & Hormonal Exposure from Synthetic Clothes

Skin Irritation and Synthetic Fabric Allergies

Studies show that up to 70% of individuals with sensitive skin report rashes, itching, or contact dermatitis when wearing synthetic clothing, particularly during heat, humidity, or physical activity [16,17]. The culprits are often chemical additives used in the manufacturing process—such as phthalates and heavy-metal dyes—which can leach out with sweat and friction.

For those with conditions like atopic dermatitis (eczema), the issue can be even more pronounced. Between 60–70% of patients with this condition experience worsening symptoms when wearing synthetic garments [18]. One key reason is the lack of breathability in synthetic fibers, which tend to trap moisture and heat against the skin—creating an environment that irritates rather than protects.

Infections and Bacterial Imbalance in Intimate Areas

Synthetic fabrics like polyester, nylon, and spandex are commonly used in underwear for their stretch and form fit. But these same properties can lead to unintended consequences, especially in the intimate area.

Because they trap heat and moisture against the skin, these fabrics create a warm, humid environment ideal for the overgrowth of yeast and harmful bacteria. As a result, they significantly increase the risk of vaginal infections like candidiasis and bacterial vaginosis [19].

Unlike natural fibers, synthetic textiles lack breathability and do not wick moisture away effectively. This can lead not only to discomfort, but also to a disruption of the vaginal microbiome—the natural balance of bacteria that helps protect against infection [5,19].

Hormone-Disrupting Chemicals in Synthetic Clothing

Beyond the issue of moisture, synthetic underwear also carries a hidden chemical risk. Analyses have revealed that many of these textiles contain endocrine-disrupting chemicals (EDCs) such as phthalates, bisphenols, and nonylphenols [5,20,21].

These chemicals can leach from the fabric and be absorbed directly through the skin, especially in areas with thin, permeable tissue—like the vulva [5,22].

Over time, even low-level exposure to EDCs has been linked to a wide range of health concerns, including:

• Fertility issues, such as anovulation and reduced implantation success [22]
• Menstrual and ovarian disorders, including PCOS and endometriosis [23]
• Hormone-sensitive cancers, like breast, uterine, and ovarian cancer [23]
• Pregnancy complications, from miscarriage to fetal development issues [5,24]

The evidence is clear: prolonged skin contact with chemically treated synthetics—especially in intimate garments—can directly impact reproductive and hormonal health.

That’s why opting for natural, breathable, and chemical-free fabrics—such as organic cotton or alpaca wool—is not just a comfort decision. It’s a conscious step toward safeguarding one of the most vulnerable systems in the body.

Chronic Health Risks from Synthetic Fibers

Mounting research suggests that prolonged exposure to synthetic fibers—and the chemicals embedded within them—can affect the body far beyond the surface.

As previously noted, many of these effects are especially concerning for the hormonal and endocrine systems, particularly in women. But the risks extend further.

Hormonal Imbalance and Endocrine Disruption

Endocrine-disrupting chemicals (EDCs) are substances that can mimic, block, or alter hormonal signals in the body—even at very low levels of exposure. And they are commonly found in synthetic textiles.

One example is phthalates, used to soften plastics and frequently detected in synthetic clothing, particularly in activewear. These chemicals can be absorbed through the skin or inhaled during wear, and have been shown to interfere with estrogen and testosterone production, potentially impacting fertility in both men and women [21,25].

Another widespread EDC is bisphenol A (BPA), best known for its use in rigid plastics but also present in some textile coatings. Studies have linked chronic BPA exposure to a range of metabolic and hormonal issues—including thyroid dysfunction, obesity, and insulin resistance [26,27,28].

Microplastics Found in Blood and Placenta

One groundbreaking study from 2021 found microplastics embedded in human placental tissue, raising urgent concerns about fetal exposure during pregnancy and the potential risks for developmental health [29,30].

In 2022, researchers in the Netherlands made another alarming discovery: microplastics in human blood, including particles of PET and polystyrene—materials commonly used in food packaging and synthetic fabrics [29].

These findings suggest that microfibers are capable of crossing biological barriers once thought impermeable, with the potential to accumulate in organs such as the liver, kidneys, and brain.

It’s a reminder that synthetic clothing doesn’t just stay on the surface—it interacts with the body at levels that science is only beginning to understand.

Oxidative Stress and Cellular Aging

Prolonged exposure to synthetic textiles may contribute to oxidative stress—a physiological imbalance between free radicals and the body’s natural antioxidant defenses [31]. This condition can quietly damage cells over time and is linked to a variety of long-term health issues.

Specifically, oxidative stress has been associated with:

• DNA fragmentation
• Damage to proteins and lipids
• Accelerated cellular aging
• Inflammatory diseases and neurodegenerative disorders [31,32,33]

Evidence from animal studies has shown that exposure to microplastics elevates markers of oxidative stress, while similar effects have been observed in human lung and gut cell cultures exposed to textile-derived fibers.

Who’s Most at Risk? Children, Women, and Textile Workers

While synthetic fibers pose risks to everyone, certain groups are especially vulnerable due to their stage of development, daily environments, or levels of exposure.

Why Children Are More Vulnerable to Airborne Microplastics from Clothing

Children breathe faster than adults and spend much of their time close to the ground—where dust and microfibers settle. As a result, they inhale up to three times more microplastics than adults on a daily basis [3,34].

Their respiratory systems are still developing, which makes them more susceptible to inflammation and damage caused by airborne toxins. A study from the University of Oklahoma revealed that indoor environments—where children spend more than 90% of their time—are reservoirs of airborne microplastics, often from synthetic carpets, upholstery, and clothing [34].

Potential health impacts include:

• Worsening of asthma symptoms
• Impaired development of the alveoli (air sacs in the lungs)
• Disrupted immune function

How Synthetic Clothing Affects Women's Hormonal and Reproductive Health

Women may face greater exposure risks due to higher dermal contact with synthetic textiles—such as tight sportswear, underwear, and bras—particularly in warm or humid conditions.

Chemical additives in these fabrics, including phthalates and BPA, can act as xenoestrogens—chemicals that mimic or disrupt natural hormones [19,26,27,28,29]. Prolonged contact can interfere with hormonal signaling, potentially affecting reproductive health and increasing the risk of hormone-sensitive conditions.

Occupational Exposure to Synthetic Fibers: The Health Risks for Textile Workers

Those who manufacture, cut, or dye synthetic textiles often work in high-fiber concentration environments, where air ventilation is limited and exposure is constant.

Studies have shown that up to 4% of textile workers develop interstitial lung diseases, including fibrosis and chronic bronchitis, as a result of prolonged inhalation of fibers and exposure to chemical treatments used in textile production [35,36].

How to Build a Plastic-Free Wardrobe: Healthier Habits that Start with What You Wear

• Choose natural, breathable fabrics like 100% organic cotton or alpaca wool—especially for base layers, underwear, and activewear. These materials help minimize chemical absorption and allow your skin to breathe naturally.
• Avoid tight-fitting synthetic garments, particularly in warm or humid conditions. Friction and moisture retention can increase the risk of skin irritation, yeast infections, and bacterial imbalance.
• Wash clothes in cold water and air dry when possible. This reduces microfiber shedding by up to 80% and helps your garments last longer.
• Rinse new garments before wearing. This helps remove residual dyes, finishing agents, and formaldehyde that may still linger from production.
• Read clothing labels carefully. Be cautious with polyester, nylon, acrylic, and elastane—especially in intimate or skin-tight items.
• Avoid “moisture-wicking” synthetics during workouts if you’re prone to irritation. Natural fibers like alpaca offer high breathability and moisture management—without the chemical coatings.
• Support transparent, ethical brands that disclose their textile sources, avoid petroleum-based blends, and commit to truly sustainable practices.
• Share what you’ve learned. Host a clothing swap, talk to friends and family, or support community efforts to reduce plastic in fashion. Awareness grows through conversation.

At Arms of Andes, we believe true performance supports both human health and ecological balance. That’s why we create garments from 100% natural alpaca wool and plastic-free—for those who move through life with purpose, and who refuse to wear what harms them.

The truth is, synthetic clothing has long been marketed as the practical choice: affordable, quick-drying, high-performance. But behind every plastic thread lies a cost—to our bodies and to the planet.

Every microfiber we inhale. Every drop of BPA our skin absorbs. Every synthetic wash cycle that releases invisible pollutants into the environment. These aren’t isolated incidents. They’re part of a system built on convenience, not consequence.

If our clothes are making us sick, why is the industry still calling it performance?

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