BKMBKM via Amazon [amazon.com] has
BKMBKM Men's Quick Dry Moisture Wicking Slim Fit Polo Shirt (Black) on sale for $9.99 - $3.00 off when you apply promo code
RFA2OR8D at checkout =
$6.99. Shipping is free w/ Prime or on orders $35+.
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Features:- 85% nylon, 15% spandex blend
- Moisture-wicking and quick-dry properties
- High stretch fabric
- Slim fit; fits true to size
- Classic polo collar with button placket
- Short sleeves
- Lightweight construction
- Machine washable
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Breaking it down by concern:
Microplastic shedding: All synthetics shed microfibers when washed. Polyester tends to shed somewhat more than nylon in some studies, but spandex (usually blended, rarely 100%) adds its own shedding when combined with other fibers. None of the three is "clean" here.
Chemical finishes/dyes: This depends more on manufacturing and finishing processes (flame retardants, water-repellent coatings, dyes) than on the base polymer. A polyester garment with no chemical finish can be "cleaner" than a nylon one treated with PFAS-based water resistance, for example.
Breathability/skin irritation: Nylon is generally more breathable and moisture-wicking than polyester, which can matter for skin comfort or sweat-related irritation, but this isn't really a "toxicity" issue.
Spandex specifically: It's almost always blended (5–20%) with other fibers, so it's rarely the dominant factor either way.
Bottom line: If your concern is microplastics or endocrine-disrupting chemicals, look at the finishing treatments (PFAS "stain-resistant" or "wrinkle-free" labels are the bigger red flag) and washing practices (cold wash, microfiber filter bags) rather than choosing nylon/spandex over polyester. Natural fibers (cotton, wool, linen) are the actual alternative if you want to avoid synthetics altogether.
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