Garmin · Waterproof Fitness Trackers & Cases
Garmin UltraFit Nylon Strap
Low risk. Plain nylon typically won't contain PFAS without treatment.
Garmin's UltraFit nylon strap is plain textile with no waterproof or stain-resistant coating documented. Uncoated nylon runs lower PFAS risk than treated outdoor gear.
We flunk more products than we pass. This one earned its grade. How we grade
Material
Nylon textile strap
Brand disclosure
Brand is silent on PFAS
Lab data
No public lab test
What’s concerning
Category baseline
The starting point for this type of product, before anything specific to this product is counted.
No PFAS disclosure
No public statement from the brand about PFAS in this product.
Azo dyes (synthetic colorants)
If the strap contains dark colors, azo dyes are possible; these can release aromatic amines under sweat and friction. Garmin does not disclose dye composition. Risk is low under normal wear but not ruled out without third-party testing.
Microfiber shedding or degradation
Nylon straps can shed microfibers with age and friction, particularly at seams and attachment points. Shed fibers are ingested only if directly transferred to food/mouth; dermal absorption is not a pathway.
Allergic contact dermatitis from dyes or finishes
Sensitive individuals may react to unknown dyes or residual processing chemicals, manifesting as localized rash under the strap. This is unpredictable without dermatological patch testing and affects a small fraction of users.
What’s reassuring
Base material not linked to PFAS
The main material recorded for this product is not one associated with PFAS.
Formaldehyde / VOCs
No public evidence of formaldehyde-releasing dyes in Garmin UltraFit nylon. Standard nylon straps rarely undergo heavy formaldehyde resin treatment, making this hazard unlikely for this product.
Source, ATSDR ↗Antimony in polyester coatings
This strap is pure nylon, not polyester, so antimony catalysts are not relevant. No antimony risk identified for this product.
The full breakdown
What it's made of and why it matters
The UltraFit strap is nylon textile, a synthetic polymer that is chemically stable and non-reactive during normal wear. Nylon does not leach plasticizers or volatile organics under typical wrist temperatures (under 40°C). The strap's primary exposure route is skin contact, which poses minimal risk from the base polymer itself.
The brand's record and disclosure
Garmin does not publicly disclose detailed material safety data or chemical composition for watch straps, which is typical for the industry. No recalls or safety warnings have been issued for UltraFit nylon straps. The brand has not made specific PFAS commitments for textiles, leaving water-repellent coating treatment status unclear, though plain nylon carries lower inherent PFAS risk than treated variants.
How it compares in its category
Nylon watch straps show lower concern than some textile options; they avoid formaldehyde-heavy finishes common in cotton and avoid heavy metal dyes more typical of multicolored fabrics. Garmin's UltraFit is mainstream and uncontroversial compared to straps with antimicrobial coatings or dyes from unknown suppliers. Silicone straps may offer comparable safety but sometimes contain uncertified fillers.
If you buy it
Clean periodically with mild soap and water to remove sweat and dirt, which reduces skin irritation risk. Inspect for fraying or degradation annually; replace if fabric separates from the attachment points. Avoid prolonged contact with strong solvents or heat sources above 60°C, though normal daily wear poses no risk. Do not machine wash; hand wash only.
What we don’t know
- Basis
- Model estimate, 72% confidence, not a lab result
- Lab test
- None on record for this exact product
- Brand statement
- Garmin has made none
Formulations change between production runs, so check the current label. How we grade.
More waterproof fitness trackers & cases grades
How we score, every product runs through the same public 0-100 rubric based on materials, coatings, brand disclosure, lab findings, and recalls. See the full methodology → Spotted a mistake? Report an error.