Apple · Waterproof Fitness Trackers & Cases
Apple Watch Series 2 Waterproof Case with Band
Skip this. Unknown waterproof treatment chemistry must be disclosed.
Apple Watch Series 2 uses waterproof sealing but won't say if fluorinated compounds are involved. Fluoroelastomer seals and waterproof treatments commonly get PFAS.
The better-graded swap
Moto
Motorola Moto G Pure Smartwatch Fitness Activity Tracker
85/100 safety
Same rubric that flunked this product. The swap earned Excellent.
Still want this one anyway? Check the price on Amazon. We’d swap it.
Material
Aluminum, stainless steel, fluoroelastomer seals with unspecified waterproof treatment
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.
Waterproof / stain-resistant treatment
Water-repellent coating treatments have historically used PFAS.
Undisclosed waterproof treatment chemistry
Apple has not revealed what chemical coating or treatment is used to render the case water-resistant. PFAS compounds are common in waterproofing but cannot be ruled in or out without disclosure. This is the primary uncertainty.
Fluoroelastomer seal degradation
Fluoroelastomer seals degrade with temperature, sunlight, and repeated flexing over 2-5 years. Degradation itself is not acutely toxic but compromises waterproofing, allowing moisture ingress that corrodes internal components and risks skin contact with corroded metals.
Water contamination if seals fail
If the case seals degrade or are damaged, internal moisture can accumulate and corrode the watch or introduce bacteria. This is a mechanical rather than chemical hazard but is a known risk of all waterproof cases with mechanical seals.
What’s reassuring
Aluminum leaching from case body
Skin irritation from nickel in stainless steel
Stainless steel in consumer wearables is typically nickel-containing. Apple has not disclosed the exact stainless steel grade. No allergic reactions to this case model are on record, but individuals with nickel sensitivity may experience contact dermatitis after prolonged wear.
The full breakdown
What it's made of and why it matters
This case combines aluminum and stainless steel, both inert metals with established safety records in consumer contact. The waterproofing relies on fluoroelastomer (synthetic rubber) seals that form a mechanical barrier rather than a chemical coating. However, Apple has not publicly disclosed the chemistry of any water-resistance treatment applied to the case itself, which is the source of concern given the prevalence of PFAS compounds in commercial waterproofing formulations.
The brand's record and disclosure
Apple does not publicly disclose waterproofing chemistry for wearables and has made no commitments to PFAS-free manufacturing. The company has faced criticism for opacity on material sourcing and surface treatments. No recalls or established safety controversies specific to this case model are on record for material leaching or coating degradation, but the lack of transparency prevents full assessment.
How it compares in its category
Aluminum-based waterproof cases are standard in fitness tracker accessories. Most competitors, including Garmin and Fitbit, similarly avoid disclosing waterproof treatment chemistry. Cases with disclosed non-fluorinated hydrophobic coatings or purely mechanical sealing systems (no coating) exist but are less common at this price point. This product is typical of the category in opacity rather than exceptional.
If you buy it
Rinse the case and seals with fresh water after salt water or chlorine exposure to prevent corrosion and seal degradation. Avoid extended heat above 60C (140F), as this can compromise fluoroelastomer flexibility. Inspect seals annually for cracks or hardening; replace if visible damage occurs. Do not assume the case will remain waterproof indefinitely; seals degrade with age and use.
What we don’t know
- Basis
- Model estimate, 35% confidence, not a lab result
- Lab test
- None on record for this exact product
- Brand statement
- Apple has made none
Formulations change between production runs, so check the current label. How we grade.
Better-graded alternatives in Waterproof Fitness Trackers & Cases
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Water Resistant Watch Model 8R500 - Men
On watch case and band
Polymer case and band degradation
Limited concern
Bacterial or mold growth in seals and band
Limited concern
No coating described, and no PFAS statement from the brand.
⚠Brand says nothing about PFAS
TomTom
Tom Tom Sport Runner Wrist Watch Model 8rs00 Water Resistant Wide Band
Plastic/elastomer band
Coating degradation and peeling
Limited concern
Bacterial or mold growth in band seams
Limited concern
No coating described, and no PFAS statement from the brand.
⚠Brand says nothing about PFAS
TomTom
Black Tomtom Water Resistant Watch Model 8rs00 With Wristband
Plastic/elastomer wristband, exact
Elastomer degradation and off-gassing
Limited concern
Bacterial growth in seals and crevices
Limited concern
Contact dermatitis from additives or microbial buildup
Limited concern
No coating described, and no PFAS statement from the brand.
⚠Brand says nothing about PFAS
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.