Fitbit Review, Is Fitbit Non-Toxic?
Across 29 graded products, Fitbit averages Excellent (82/100). On disclosure, the brand says nothing publicly about PFAS. 27 of its products grade Good or better. Grades are model-based estimates, not lab results.
PFAS Authority is a scoring system, not a laboratory. We do not test products ourselves. Grades are model-based, built from published ingredients, materials, certifications, brand disclosures and third-party lab results where they exist. See the rubric.
What Fitbit says and does about PFAS
We found no PFAS policy published by Fitbit itself. Most Fitbit devices describe their bands only as a flexible, lightweight silicone material, which Android Authority called a vague description. Google, which owns Fitbit, has said it proactively limits PFAS in its products, and its supplier chemical specification caps PFHxA, one type of PFAS, at 25 ppb in all materials.
- MaterialsAndroid Authority reported that most Fitbit devices describe the strap only as a flexible, lightweight silicone material similar to that used in many sports watches. Android Authority (archived page) ↗
- Brand statementGoogle told Android Central it proactively limits PFAS in its products and is committed to minimizing PFAS beyond what is required by law. Android Central ↗
- Brand statementGoogle’s supplier chemical specification limits PFHxA and its salts to 25 ppb in all materials. Google supplier specification ↗
Sources checked September 14, 2026. A brand statement is the company’s own claim, which we report but have not verified. Our grades are model-based estimates, not lab tests.
Does Fitbit have PFAS, by category
Worth buying from Fitbit Good or better, best-graded first
Fitbit
Luxe Fitness Tracker
Stainless steel case, elastomer band
Elastomer band degradation and skin irritation
Elastomer bands can degrade under UV exposure or high heat, potentially becoming sticky…
Bacterial or fungal growth under band
Any wearable band can trap moisture and sweat if not cleaned regularly, creating a…
Waterproof seal failure and internal corrosion
While the stainless steel case resists corrosion, repeated submersion or seal degradation…
No coating described, and no PFAS statement from the brand.
⚠Brand says nothing about PFAS
Fitbit
Versa 3 Smart Watch
Aluminum case, elastomer band
Heavy metals
Aluminum alloys often contain nickel, cobalt, or chromium as strengthening agents. No…
Elastomer band degradation and plasticizer leaching
Elastomer compounds typically contain plasticizers or softening agents to maintain…
Bacterial or fungal growth in band material
Elastomer bands trap moisture and are difficult to fully dry; users commonly report skin…
Allergic contact dermatitis from unknown additives
Elastomer bands may contain accelerators, vulcanization agents, or colorants that can…
No coating described, and no PFAS statement from the brand.
⚠Brand says nothing about PFAS
Fitbit
Sense Advanced Health Smartwatch
Stainless steel case, glass screen, elastomer/silicone band
Nickel in stainless steel (skin contact allergen)
Stainless steel case and any metal buckles or connectors contain nickel as part of the…
Skin irritation from moisture and bacteria trapping
Tight or prolonged band wear over damp skin can trap moisture and encourage bacterial or…
No coating described, and no PFAS statement from the brand.
⚠Brand says nothing about PFAS
Fitbit
Inspire 3 Fitness Tracker
Plastic/elastomer band, stainless steel, glass display
Elastomer band degradation and sweat interaction
Elastomer bands may degrade or soften with prolonged sweat and heat exposure over months…
Bacterial growth under band
Moisture and skin contact under the band create a microenvironment where bacteria and…
No coating described, and no PFAS statement from the brand.
⚠Brand says nothing about PFAS
Fitbit
StrapsCo Pattern Comfort Stretch Band for Fitbit Charge 6
Elastane/spandex blend stretch fabric
Formaldehyde / VOCs
Elastane blend fabrics may be treated with formaldehyde-based dyes or wrinkle-resist…
Azo dyes (synthetic colorants)
The colored pattern weave likely uses azo dyes, which are standard in affordable textiles…
Antimony in polyester base fibers
If the base layer is polyester, antimony trioxide (a catalyst used in polyester…
Microplastic shedding during wear and wash
Elastane and polyester fibers shed microfibers during washing and prolonged friction.…
Lower concern. Material as recorded is not linked to PFAS.
⚠Brand says nothing about PFAS
Fitbit
Vodtian Elastic Bands for Fitbit Versa 4/Versa 3/Sense 2/Sense
Elastic silicone or rubber band
Elastomer degradation and leaching
Silicone and rubber elastomers can release low-molecular-weight oligomers if exposed to…
Skin irritation from residual manufacturing oils or contaminants
New elastomer bands may retain mold-release agents, dust, or other manufacturing residues…
Lower concern. Silicone elastomer bands unlikely to have PFAS.
⚠Brand says nothing about PFAS
Fitbit
Ace LTE Courtside Active Band
Elastomer/silicone band
Azo dyes and colorant safety
The band's color (Courtside implies a sports/team shade) may involve synthetic dyes.…
Heavy metals
Fitbit does not publish colorant heavy-metal limits specific to this band. US CPSC rules…
No coating described, and no PFAS statement from the brand.
⚠Brand says nothing about PFAS
Fitbit
WITHit Fitbit Charge 5 & 6 3-pack Bands
Silicone and elastomer watch bands
Coating degradation and leachables from band surface
Silicone itself does not degrade into toxic monomers at skin temperature, but surface…
Microbial growth and odor from moisture retention
Silicone bands trap sweat in connector grooves and around the clasp if not rinsed…
Lower concern. Silicone bands carry minimal PFAS risk without water-repellent coating treatment.
⚠Brand says nothing about PFAS
Fitbit
WITHit Fitbit Versa 3 & Fitbit Sense Silicone Band
Silicone elastomer band
Skin contact sensitization or irritant dermatitis
Individual sensitivity to silicone or residual manufacturing compounds is rare but…
Bacterial or fungal growth on band surface
Any wearable band, including silicone, can harbor moisture and microbes if not dried…
Silicone bands carry low PFAS risk, but no brand disclosure available.
⚠Brand says nothing about PFAS
Fitbit
Infinity Band
Elastomer/silicone band
Silicone degradation and particulate shedding
Silicone bands can degrade over extended use (12-24+ months), especially with UV exposure…
No coating described, and no PFAS statement from the brand.
⚠Brand says nothing about PFAS
Fitbit
Mykomi Waterproof Bands for Fitbit Versa 3 / Fitbit Versa 4 / Fitbit Sense
Silicone elastomer
Silicone degradation over time
Silicone elastomer can lose elasticity and develop micro-tears with prolonged UV exposure…
Bacterial or fungal colonization
Any elastomer band can trap moisture in seams and under the watch face if not dried…
No coating described, and no PFAS statement from the brand.
⚠Brand says nothing about PFAS
Fitbit
Sense Outdoor Band
Elastomer band
Elastomer degradation and hygiene
Elastomer bands can accumulate bacteria and sweat residue in seams over time. While the…
Phthalates
Some elastomer formulations may contain trace phthalates as plasticizers to improve…
Allergic contact dermatitis from elastomer or accelerators
Elastomer bands can rarely trigger contact dermatitis in individuals sensitive to rubber…
No coating described, and no PFAS statement from the brand.
⚠Brand says nothing about PFAS
Fitbit
Charge 5 Unicorn Beetle PRO Rugged Case and Band
Silicone/TPU band, polycarbonate case
Silicone and TPU degradation over time
Extended UV exposure or high heat can cause silicone and TPU to break down, potentially…
Skin irritation from residual manufacturing contaminants
Silicone and TPU bands may occasionally retain traces of uncrosslinked oligomers or…
Bacterial growth in band crevices if unwashed
Any band that contacts skin directly can trap bacteria and fungi in seams or texture if…
No coating described, and no PFAS statement from the brand.
⚠Brand says nothing about PFAS
Fitbit
Google Fitbit Air Active Band
Elastomer band, likely rubber or silicone
Contact dermatitis or skin sensitization from elastomer additives
Silicone and synthetic rubber bands may contain accelerators, vulcanizing agents, or…
Bacterial or mold growth in crevices
Elastomer bands can trap moisture and sweat in gaps between band and device connector if…
No coating described, and no PFAS statement from the brand.
⚠Brand says nothing about PFAS
Fitbit
Fintie Bands for Fitbit Versa 4/3/2/1/Versa Lite/Fitbit Sense 2/Sense
Silicone and stainless steel band
Nickel release from stainless steel hardware
Stainless steel connectors and buckles may contain trace nickel (typical 8-12% in…
Silicone degradation and discoloration
User forums document silicone bands yellowing, hardening, or becoming tacky after 1-2…
Bacterial colonization from moisture retention
Silicone's porous surface can trap sweat, oils, and bacteria if not cleaned regularly.…
Connector and buckle corrosion
Stainless steel hardware can corrode or discolor if exposed to salt water, chlorine, or…
Lower concern. Silicone bands rarely require PFAS-based treatments.
⚠Brand says nothing about PFAS
Fitbit
StrapsCo Active Protective Case Strap for Fitbit Charge 5
silicone or elastomer strap, likely no intentional PFAS coating
Bacterial or fungal growth (skin contact surface)
Silicone wrist straps trap sweat and dead skin cells. Poor hygiene or infrequent washing…
Skin irritation or contact dermatitis
Some individuals report mild irritation from silicone wristband wear, though this is…
Material degradation and microplastic shedding
Lower-cost silicone or elastomer blends may degrade more rapidly and shed particles after…
Lower concern. Silicone strap unlikely to contain PFAS, but brand offers no disclosure.
⚠Brand says nothing about PFAS
Fitbit
SUPCASE Unicorn Beetle Pro Series Design Replacement Bands for Fitbit Inspire & Fitbit Inspire
Silicone or elastomer band (unspecified polymer)
Skin sensitization or contact dermatitis from elastomer additives
Silicone and synthetic elastomers can contain release agents, UV stabilizers, or residual…
Bacterial or fungal growth on band surface
Silicone and elastomer surfaces can harbor bacteria and fungi if not cleaned regularly…
Degradation and microparticle shedding with age or UV exposure
Silicone and elastomer can degrade, become sticky, or shed microparticles after months of…
Allergic reaction to fragrance or dye in colored bands
If the band includes colorants or dyes (common in non-white elastomers), azo dyes or…
Lower concern; silicone bands rarely use PFAS, but material unconfirmed.
⚠Brand says nothing about PFAS
Fitbit
Supcase Rugged Buckle Case for Fitbit Ionic,Strap Replacement Bands for Fitbit Ionic Smartwatch
Silicone, elastomer, stainless steel bands
Bacterial and mold growth
Silicone is porous and can harbor bacteria if not cleaned regularly, particularly in…
Allergic contact dermatitis from manufacturing residues
Residual talc, sulfur, or mold-release agents from silicone molding can occasionally…
Low risk. Silicone and stainless steel don't typically contain PFAS.
⚠Brand says nothing about PFAS
Fitbit
North Street Watch Co. Rugged Rubber Case Strap for Fitbit Charge 6
rubber strap
Vulcanization residues and accelerators
Rubber straps contain trace zinc oxide and sulfur-based vulcanization agents used in…
Degradation products from sweat and heat
Sweat (salt, urea, lactic acid) and body heat can gradually break down rubber polymers…
Low risk. Rubber straps don't show typical PFAS warning signs.
⚠Brand says nothing about PFAS
Fitbit
Google Fitbit Air Screenless Health & Fitness Tracker
Plastic housing, elastomer band
Elastomer band degradation and leaching
Elastomer bands can degrade with sweat, sunlight, and heat over extended use. Minor…
Skin sensitivity or contact dermatitis from band material
Individual cases of rash or irritation from wearables are documented in user forums and…
Microplastics
Elastomer bands can shed microscopic particles during friction with skin or when washing.…
No coating described, and no PFAS statement from the brand.
⚠Brand says nothing about PFAS
Fitbit
Inspire 3 Fitness Tracker Health
Plastic band, elastomer strap
Elastomer degradation and skin irritation
Elastomer straps can degrade over 1-2 years of daily wear, especially if exposed to…
Bacterial or fungal growth on strap
Moist, warm environment under the band can promote bacterial and fungal growth if the…
No coating described, and no PFAS statement from the brand.
⚠Brand says nothing about PFAS
Fitbit
Versa 4 Fitness Smartwatch
Aluminum case, resin band
Aluminum leaching
Prolonged contact with acidic sweat may leach small amounts of aluminum from the case.…
Resin band dermatitis or off-gassing
Elastomer resin can release volatile organic compounds (VOCs) initially and may trigger…
Bacterial or fungal growth on band
Resin bands can harbor bacteria and mold if not dried fully after water exposure or sweat…
No coating described, and no PFAS statement from the brand.
⚠Brand says nothing about PFAS
Fitbit
Versa 4 Smart Sports Watch
Aluminum case, elastomer band
Elastomer band degradation and microparticle shedding
Elastomer bands degrade under UV, sweat, and thermal stress over 1-3 years of continuous…
Bacterial or fungal growth at band-case interface
Moisture and sweat trapped between the band and case can foster microbial growth if not…
Skin sensitization from band contact allergens
Elastomer bands may contain residual monomers, accelerators, or processing aids that…
No coating described, and no PFAS statement from the brand.
⚠Brand says nothing about PFAS
Fitbit
Charge 6 Fitness Tracker
Elastomer band, stainless steel case
Bacterial growth / skin irritation from band material
Elastomer bands can trap sweat and bacteria if not cleaned regularly, potentially causing…
Nickel leaching from stainless steel hardware
Although stainless steel is inert in most conditions, low-grade stainless steel or…
Elastomer degradation and microparticle shedding
Over years of wear, elastomer bands can degrade and shed microscopic particles…
No coating described, and no PFAS statement from the brand.
⚠Brand says nothing about PFAS
Fitbit
Sense Smartwatch
Aluminum, stainless steel, rubber
Rubber band skin contact and additives
Elastomer straps may contain plasticizers or accelerators that can leach with sweat and…
Bacterial and fungal growth on rubber and crevices
Wearable devices with rubber bands and metal-rubber interfaces are known to harbor…
Aluminum oxidation and surface degradation
The aluminum case may develop white oxide or patina over years of wear, and micro-cracks…
Allergic reaction to stainless steel or nickel content
Stainless steel components can contain nickel (typically 8-12% in 300-series alloys).…
No coating described, and no PFAS statement from the brand.
⚠Brand says nothing about PFAS
Fitbit
Charge 6 Health & Fitness Tracker
Plastic band, metal buckle
Nickel allergen (metal buckle)
If the buckle is nickel-plated, direct contact with sensitive skin could trigger contact…
Bacterial growth (elastomer band)
Elastomer bands worn against skin in warm, moist conditions can harbor bacteria if not…
Elastomer degradation over time
Thermoplastic elastomers can degrade with prolonged UV exposure, high heat, or repeated…
No coating described, and no PFAS statement from the brand.
⚠Brand says nothing about PFAS
Fitbit
Charge 6 Fitness Tracker
Elastomer band, stainless steel case
Elastomer contact dermatitis
Elastomer bands can trigger skin irritation in individuals with sensitive skin or rubber…
Elastomer degradation with heat/UV
Prolonged exposure to high temperature or direct sunlight can cause elastomer to become…
Bacterial or fungal growth in band material
The porous nature of elastomer can harbor bacteria or fungi if the band is not cleaned…
No coating described, and no PFAS statement from the brand.
⚠Brand says nothing about PFAS
Graded and flagged Poor and Bad, we’d swap these
Fitbit
Google Fitbit Air Performance Loop Band
Nylon blend with water-resistant treatment
Formaldehyde / VOCs
Nylon textiles often retain trace formaldehyde from dye-fixing and resin treatments…
Azo dye contamination and skin sensitization
The band's color (typically dark blue or black in performance loops) suggests azo-based…
PFAS
Even if non-PFAS, newer fluorine-free water-repellent coating alternatives (e.g.…
Microfiber shedding from synthetic blend
Nylon blends shed microfibers during washing and wear, which can accumulate on skin and…
Wait until Fitbit reveals water-repellent coating chemistry.
⚠Waterproof or stain-proof treatment
Fitbit
Smartwatch Band
Silicone, elastomer, or Teflon-family coating elastomer (unspecified)
Elastomer additive migration (plasticizers, slip agents)
Silicone and elastomer bands contain processing additives that can leach in small amounts…
Degradation and microparticle shedding
Repeated flexing, UV exposure, and heat exposure (showering, sweating) degrade elastomers…
Heavy metals
Silicone bands are pigmented for aesthetic variation; non-regulated dyes or colorant…
Contact dermatitis or irritation from uncertified elastomers
Scattered user reports exist of skin irritation from Fitbit bands in online forums…
Smartwatch bands often use water-resistant elastomers, PFAS presence unclear.
⚠Waterproof or stain-proof treatment
Fitbit and PFAS, common questions
- Does Fitbit have PFAS?
- We graded 29 Fitbit products, averaging Excellent (82/100). 27 grade Good or better. Grades are model-based estimates built from published materials, ingredients and disclosures, not lab tests. Fitbit describes most of its bands only as silicone, and Google, which owns Fitbit, says it proactively limits PFAS in its products.
- Is Fitbit non-toxic?
- Fitbit Luxe Fitness Tracker is the highest-graded Fitbit product we have scored, at 85/100. It depends on the product line rather than the brand, so check the grade of the exact item you are buying.
- Which Fitbit products are lower concern for PFAS?
- The highest-graded Fitbit products we have scored are Fitbit Luxe Fitness Tracker, Fitbit Versa 3 Smart Watch, Fitbit Sense Advanced Health Smartwatch. That is our model-based estimate from materials and public disclosure, not a lab test.
- Which Fitbit products should I avoid?
- The lowest-graded Fitbit products we have scored are Fitbit Smartwatch Band, Google Fitbit Air Performance Loop Band. Each one links to the evidence behind its grade.
Every grade uses the same public rubric. How grades work →