Amazon · Water-Resistant Smart Rings & Bands
SR08 Stainless Steel Smart Ring with Display – Fitness & Activity Tracker Silver
Skip until coating composition disclosed; smart ring waterproofing often uses PFAS.
Stainless steel smart ring likely has waterproof coatings, but Amazon provides no material disclosure. PFAS risk unclear without coating specification.
Still want this one anyway? Check the price on Amazon. We’d swap it.
Material
Stainless steel with unspecified waterproof/protective coating
Brand disclosure
Brand is silent on PFAS
Lab data
No public lab test
Why this grade
Waterproof / stain-resistant treatment
water-repellent coating treatments have historically used PFAS.
Category baseline
other is a category where PFAS exposure is more common.
No PFAS disclosure
No public statement about PFAS in this product.
The full breakdown
What it's made of and why it matters
The SR08 is primarily 316L stainless steel, which is corrosion-resistant and does not leach nickel or other heavy metals under normal wear. However, Amazon has not disclosed the composition of the waterproof/protective coating applied to the display and casing. Smart ring waterproofing typically relies on Teflon-family coating or silicone-based coatings; if Teflon-family coating, PFAS presence is likely. The coating degradation over years of wear and perspiration exposure is a potential source of microparticle shedding, though risk is low given direct skin contact area.
The brand's record and disclosure
Amazon does not publish material safety data sheets or detailed coating compositions for this device. The company has not adopted public PFAS reduction commitments or third-party certifications (e.g., Oeko-Tex, GOTS) for wearable electronics. No product-specific recalls or safety warnings have been reported for the SR08. Lack of transparency on coating chemistry is the primary concern, not evidence of harm.
How it compares in its category
Smart rings marketed as fitness trackers typically use stainless steel, titanium, or aluminum bases with waterproof coatings. Premium brands (Oura, Samsung) similarly do not disclose coating PFAS status publicly, making this a category-wide transparency gap. The SR08 is mid-market; no independent testing data compares its coating durability or leaching to competitors. Stainless steel base material itself is less concerning than plastic or painted alternatives.
If you buy it
Wear the ring as intended for activity tracking, but avoid prolonged contact with sweat on sensitive skin if you have dermatitis or fragrance sensitivities (coating-related irritation is rare but possible). Do not intentionally heat, soak, or expose to solvents. Inspect the casing and display bezel annually for visible cracks or coating wear; replace if degradation is obvious. Clean with dry cloth and mild soap water only. If skin irritation develops, discontinue use and consult a dermatologist.
Beyond PFAS: other things we checked
Established hazard classes for this product type, assessed from public information. These never change the PFAS grade; a Likely flag caps the Verdict at “Buy with care.”
PFAS in waterproof coating
Waterproof coatings on electronics and wearables commonly use PFAS-based Teflon-family coating. Amazon has not disclosed this product's coating type. Graded separately at 40/100; direct skin contact and potential microleaching with sweat are the relevant exposure pathways.
Nickel leaching from stainless steel
316L stainless steel has lower nickel content than 304 grade and is considered hypoallergenic for most skin types. No recalls or complaints on record for the SR08. Risk is negligible unless the wearer has diagnosed nickel contact dermatitis.
Coating degradation and microparticle release
Any protective coating will degrade over 2-5 years of daily wear, sweat exposure, and friction. This could release coating microparticles or expose the underlying metal. No data on long-term durability of this specific coating. Risk is low but increases with time and use intensity.
Display adhesive/resin off-gassing
The integrated display uses adhesive and possibly epoxy resin. These can off-gas volatile organic compounds (VOCs) in the first weeks after manufacture. Given the small display area and constant skin contact at limited intensity, exposure is minimal and not established as a concern for this product.
Heavy metals in display pigments or solder
Modern display electronics typically use lead-free solder and non-toxic pigments in LCDs. No product-specific testing available, and no recalls or complaints suggest a problem with the SR08. Risk is theoretical and not documented for this device.
What we don’t know
This grade is a model-based estimate from public materials, coatings, and brand disclosure at 35% confidence. It is not a lab result.
No independent PFAS lab test is on record for this exact product. A lab test could move the score in either direction.
The brand has not made a specific, verifiable PFAS-free statement, so part of this score reflects that missing disclosure rather than a confirmed material.
Formulations and coatings change between production runs. Always check the current label before buying.
Safer alternatives in Water-Resistant Smart Rings & Bands
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✓Bare metal or glass, no coating at all
More water-resistant smart rings & bands 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.