In a startling revelation, researchers have uncovered elevated levels of perfluorohexanoic acid (PFHxA), a type of "forever chemical," in several smartwatch and fitness tracker wristbands. The findings, published in the American Chemical Society’s Environmental Science & Technology Letters, shed light on potential risks posed by wearable technology accessories.
Forever chemicals, or per- and polyfluoroalkyl substances (PFAS), are known for their durability and ability to repel water, sweat, and oil. These properties make them popular in consumer goods ranging from stain-resistant fabrics to fitness wear. However, their longevity in the environment and potential health impacts have raised alarms among scientists.
Key Findings from the Study
The study, led by Graham Peaslee and co-authors Alyssa Wicks and Heather Whitehead, analyzed 22 wristbands across various brands and price points. The researchers focused on detecting fluorine—a marker for PFAS—and specifically tested for 20 individual PFAS. Here’s what they found:
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All 13 wristbands made from fluoroelastomers (a type of synthetic rubber) contained fluorine.
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Two of the nine wristbands not advertised as fluoroelastomer-based also tested positive for fluorine.
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PFHxA was the most prevalent chemical, detected in nine wristbands with concentrations ranging from 800 parts per billion (ppb) to over 16,000 ppb. For context, cosmetics previously tested by the team had a median PFAS concentration of 200 ppb.
"We have never seen extractable concentrations in the part-per-million range for any wearable consumer product applied to the skin," said Peaslee. While the long-term health effects of PFHxA absorption through the skin are not fully understood, recent studies suggest significant absorption potential.
A Safer Alternative: Merino Wool Watch Bands from Some Loops
For consumers concerned about PFAS exposure, the study’s authors recommend opting for lower-cost silicone wristbands or carefully scrutinizing product descriptions to avoid fluoroelastomers. However, one manufacturer is taking safety and sustainability a step further: Some Loops offers smartwatch bands made from 100% merino wool.
Unlike synthetic materials that may contain harmful chemicals, merino wool is a natural, time-tested, biodegradable fiber. It’s soft on the skin, breathable, and free from PFAS, ensuring that users can enjoy their wearables without compromising their health or the environment. Some Loops’ patented in-house technology and commitment to eco-friendly, safe materials set a high standard in an industry increasingly scrutinized for its chemical usage.
What Can Consumers Do?
To minimize exposure to potentially harmful substances, consumers can:
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Choose wristbands made from natural or silicone-based materials.
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Avoid products explicitly labeled as containing fluoroelastomers.
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Support brands like Some Loops that prioritize sustainable and chemical-free manufacturing practices.
The revelation about PFAS in wearable tech underscores the importance of informed purchasing decisions. As researchers continue to study the health impacts of these chemicals, consumers have the power to make safer choices today.
About the Study
This research was supported by the University of Notre Dame and published in Environmental Science & Technology Letters. For further details, journalists can contact newsroom@acs.org. link to published white paper.