MiiR · Insulated Drink Tumblers
Climate+ Tumbler 12 oz
Lower concern; stainless steel tumbler with no known PFAS-associated features.
MiiR's stainless steel tumbler lacks coatings, linings, or waterproof treatments typically associated with PFAS. No brand disclosure on PFAS, but the bare metal construction suggests lower risk.
We flunk more products than we pass. This one earned its grade. How we grade
Material
Stainless steel body, vacuum insulation
Brand disclosure
Brand is silent on PFAS
Lab data
No public lab test
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What Climate+ Tumbler 12 oz is made of, ingredients and materials
The Climate+ Tumbler is constructed from food-grade stainless steel (typically 18/8 or 304 grade) with vacuum insulation between double walls. Stainless steel does not leach heavy metals like lead or cadmium under normal beverage use, and vacuum insulation eliminates the need for chemical coatings or non-stick surfaces that might degrade. The sealed air gap means no polymer liners or adhesives contact your drink directly, reducing exposure to off-gassing or leachable compounds.
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.
Seal and gasket material degradation
Lid gaskets are typically silicone or rubber; prolonged exposure to hot liquids or dishwasher cycles can degrade elastomers over time, potentially allowing bacterial colonization in seams. No known leachate risk from new seals under normal use.
Vacuum seal integrity loss
Over years, the seal between inner and outer walls may fail, compromising insulation but not releasing hazardous materials. This is a durability and performance issue, not a toxicity concern.
What’s reassuring
Base material not linked to PFAS
The main material recorded for this product is not one associated with PFAS.
Stainless steel corrosion and nickel leaching
Food-grade stainless steel (304/18-8) is highly resistant to corrosion by water and beverages at pH 3-10. Nickel leaching into drinks is not on record for this product class under standard use conditions; the passive oxide layer on steel prevents release.
Coating or adhesive on interior surfaces
No coating or internal adhesive is named in available product specifications or marketing materials for the Climate+ line. Bare stainless steel interior is the standard for this category.
Heavy metals
Stainless steel raw material is inherently low in lead and cadmium; no contamination recalls or test reports exist for MiiR tumblers. Manufacturing in facilities with known heavy-metal contamination is not on record.
Source, FDA ↗How is this PFAS grade calculated?
The brand's record and disclosure
MiiR has publicly committed to transparency on materials and maintains third-party certifications including B Corp status, which requires supply-chain and manufacturing accountability. The brand does not market health claims that would trigger heightened scrutiny, and has a documented history of responsive product recalls when issues arise. No major safety controversies or hidden composition issues are on public record for this product line.
How it compares in its category
Double-wall stainless steel tumblers avoid the coating-degradation and leaching risks common in ceramic-lined or resin-polymer travel mugs. Compared to plastic alternatives, stainless steel eliminates BPA, BPS, and phthalate exposure entirely. MiiR's vacuum insulation is competitive with brands like Hydro Flask and YETI; all three use similar materials and manufacturing standards.
If you buy it
Hand-wash the lid and seals regularly to prevent bacterial growth in crevices; do not soak seals or gaskets in hot water for extended periods as elastomers can degrade over years of use. The stainless steel body itself is extremely durable and does not require replacement. Avoid dishwasher use if the tumbler has bonded seals, as high heat can compromise the vacuum seal integrity. Replace the lid gasket every 2-3 years if you notice leaking or a decline in insulation performance.
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 Climate+ Tumbler 12 oz?
- 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.