Dangerous Chemicals Found in Smartwatch Bands
Fitness trackers and smartwatches have become an integral part of hikers’ daily lives, providing us with valuable health and fitness data. However, recent studies have raised concerns about the potential health risks associated with these devices, particularly due to the presence of harmful chemicals in their wristbands.

Many thru-hikers will bring their watch with them for navigation and recording data from their hikes. Photo: Owen Eigenbrot
Forever Chemicals in Smartwatch Bands
Research published in ACS (American Chemical Society) Environmental Science & Technology Letters highlights the presence of high levels of perfluorohexanoic acid (PFHxA), a type of “forever chemical,” in the wristbands of many smartwatches and fitness trackers. These chemicals, known as per- and polyfluoroalkyl substances (PFAS), are used in the manufacturing of fluoroelastomers, which are synthetic rubbers that make the bands durable and resistant to water, sweat, and oil. However, this durability comes at a cost, as these chemicals can leach into your body from contact with your skin, potentially posing health risks.
Health Implications
PFHxA and other PFAS have been linked to various health issues, including cancer, high blood pressure, and infertility. The study found that wristbands made from fluoroelastomers contained significantly higher levels of PFHxA compared to those made from other materials. The median concentration of PFHxA in these wristbands was nearly 800 parts per billion (ppb), with some samples exceeding 16,000 ppb. This is concerning, especially given that the Office of Environmental Health Hazard Assessment only deems 1 ppb a safe concentration.
These chemicals are absorbed more readily through the skin during activities that cause sweating, such as hiking, backpacking, and running, amplifying the risk of exposure.

Switching to silicone wristbands is a simple, affordable way to reduce exposure to harmful PFAS chemicals. Photo: Katie Kommer
Are We Doomed?
The constant onslaught of news articles proclaiming “this thing that you use every day in your life has now been found to leech toxic quantities of PFAS into your bloodstream” is frightening, demoralizing, and can be overwhelming. It’s so easy to starting questioning if taking action and making changes is worth it, since tomorrow we will likely learn of a new PFAS exposure. In this case, however, the recommended changes are simple, affordable, and effective—three excellent adjectives.
The study recommends opting for wristbands made from silicone, which do not contain fluoroelastomers and are less likely to leach harmful chemicals. Silicone bands are also durable, comfortable, and suitable for various outdoor activities, making them a great choice for hikers. They’re also generally more affordable than fluoroelastomer alternatives.
List of Smartwatches with Safe Wristbands
While the study did not provide a comprehensive list of specific smartwatch models, it emphasized the importance of checking product descriptions yourself and avoiding those that list fluoroelastomers as a material. Here are a few smartwatch brands known for offering silicone wristbands:
- Garmin: Many Garmin smartwatches come standard with silicone bands
- Fitbit: Fitbit offers a range of silicone bands for their fitness trackers and smartwatches
- Apple: Apple Watch offers silicone band options free from fluoroelastomers
- Samsung: Samsung’s Galaxy Watch series includes some models with silicone bands
In Conclusion
All you can do is your best. While it’s frustrating to feel like extra effort is needed, taking a moment to check the band’s material list for silicone can significantly reduce the amount of PFHxA leaching onto your skin. When it comes to an item you’ll be wearing close to every day, the extra work is worth it.
For more information regarding PFAS and what you can do to lower your exposure, this resource from The United States Environmental Protection Agency is a great place to start.
Featured Photo: Katie Kommer
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