MiiR · Insulated Drink Tumblers
MiiR 360 Traveler
Low concern, basic steel drinkware with no PFAS-risk features.
MiiR's stainless steel tumbler with silicone grip includes no nonstick or water-resistant coatings typically associated with PFAS. No PFAS testing has been publicly released.
We flunk more products than we pass. This one earned its grade. How we grade
Material
Stainless steel tumbler with silicone grip
Brand disclosure
Brand is silent on PFAS
Lab data
No public lab test
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What MiiR 360 Traveler is made of, ingredients and materials
The MiiR 360 Traveler is constructed from stainless steel (typically 18/8 or similar food-grade alloy), which is chemically inert and does not leach metals into beverages under normal use. The silicone grip is a polymer that softens the tumbler for handling; food-grade silicone, when properly manufactured, does not migrate harmful compounds into liquids. Stainless steel is not a material linked to PFAS concerns because the chromium-nickel matrix resists corrosion and degradation, unlike ceramic glazes or non-stick coatings.
What’s concerning
No PFAS disclosure
No public statement from the brand about PFAS in this product.
Category baseline
The starting point for this type of product, before anything specific to this product is counted.
Stainless steel nickel leaching
Nickel content in 18/8 stainless steel can leach in trace amounts if the steel is scratched or exposed to highly acidic liquids over extended periods. For most users with typical beverages (water, coffee, tea), this poses no meaningful risk; individuals with nickel sensitivity may warrant caution.
Insulation layer integrity and failure
Double-wall stainless steel tumblers occasionally develop micro-tears in the seal between walls, allowing moisture to enter. This is a durability issue rather than a chemical hazard, but a compromised tumbler should be replaced.
What’s reassuring
Base material not linked to PFAS
The main material recorded for this product is not one associated with PFAS.
Silicone grip degradation and leaching
Food-grade silicone used in this product type is not known to leach harmful compounds under normal beverage storage conditions. Risk is negligible if the silicone is certified food-safe, which is standard for reputable brands.
Bacterial growth in seams and silicone
Stainless steel tumblers with silicone grips can harbor bacteria in crevices if not thoroughly cleaned after use. This is a hygiene issue managed by regular washing; no chemical contamination is inherent to the design.
How is this PFAS grade calculated?
The brand's record and disclosure
MiiR (note, product lists 'MIRA' but the brand is MiiR) maintains a sustainability-focused public image and has published corporate responsibility statements, though detailed chemical safety disclosures are limited. No major recalls or contamination incidents are on record for this product line. The brand has not publicly committed to PFAS elimination in all manufacturing, which is typical of smaller drinkware manufacturers but represents a gap in transparency rather than evidence of risk in this specific item.
How it compares in its category
Stainless steel tumblers present lower concern than plastic drinkware (which may contain BPA or phthalates) or glazed ceramic cups (which may have lead in enamels). Among steel tumblers, the MiiR 360 Traveler sits in the mid-to-premium segment; equivalent products from brands like Hydro Flask or YETI have comparable material safety profiles. The addition of a silicone grip is standard and does not materially increase hazard risk if the silicone is food-grade certified.
If you buy it
Wash the tumbler before first use and inspect the silicone grip for any manufacturing odors; these typically off-gas in the first few uses. Avoid prolonged exposure to extreme heat (above 140°F) or direct flame, as this may degrade the silicone. Stainless steel is durable; replace it only if the insulation layer fails (indicated by sweating on the exterior) or if the seal degrades. Hand-wash to preserve the finish; dishwasher use may dull the exterior over years of use.
What is not known about PFAS in this product?
- Basis
- Model estimate, 72% confidence, not a lab result
- Lab test
- None on record for this exact product
- Brand statement
- MiiR has made none
Formulations change between production runs, so check the current label. How we grade.
What are the PFAS-free alternatives to MiiR 360 Traveler?
- Stainless steel bottle, stainless steel cap
- The brand calls it PFAS-free, which we have not verified
- Powder-coat cap degradation over time
3 hazards checked on this product, all on its full breakdown.
- Stainless steel body, powder-coat finish
- The brand calls it PFAS-free, which we have not verified
- Powder-coat finish degradation
3 hazards checked on this product, all on its full breakdown.
- Stainless steel bottle, plastic cap and silicone gasket
- The brand calls it PFAS-free, which we have not verified
- Silicone gasket degradation and leaching
3 hazards checked on this product, all on its full breakdown.
More insulated drink tumblers 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.