Reduce · Insulated Drink Tumblers
Reduce Slim Cold1 Tumbler
Lower concern. Stainless steel tumbler with no coating flagged for PFAS.
Reduce's Slim Cold1 is a stainless steel insulated tumbler with no known PFAS-related coating or treatment. No public PFAS claims or third-party verification available.
We flunk more products than we pass. This one earned its grade. How we grade
Material
Stainless steel double-wall insulated tumbler
Brand disclosure
Brand is silent on PFAS
Lab data
No public lab test
Why this grade
Safe base material
Made from a material with no inherent PFAS use (ceramic, mineral, or natural fiber).
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 Reduce Slim Cold1 is constructed from food-grade stainless steel (18/8 or similar austenitic alloy) in a double-wall vacuum-insulated design. Stainless steel is chemically inert at normal use temperatures and does not leach metals or require polymer coatings that can degrade over time. The vacuum layer eliminates contact between liquid and outer surfaces, further reducing any leaching pathway. This material class has one of the lowest contamination risks in drinkware.
The brand's record and disclosure
Reduce is a newer direct-to-consumer drinkware brand with limited public transparency on material sourcing or third-party testing. No major recalls or safety controversies are established for this model or brand in publicly available records. The company does not appear to have published PFAS-avoidance commitments or material certifications (e.g., NSF), though the stainless steel construction itself carries no known PFAS risk. Buyer reviews focus on functionality rather than safety concerns.
How it compares in its category
Stainless steel insulated tumblers are a safer baseline than plastic or coated-aluminum alternatives, which carry risks of BPA, phthalates, or non-stick coating breakdown. Compared to ceramic-lined or silicone-gripped variants, the Slim Cold1 avoids potential glaze contamination (lead/cadmium) and adhesive or elastomer leaching. Performance and price place it in mid-market competition with brands like Hydro Flask and YETI, all of which use similar stainless construction and carry comparable low chemical hazard profiles.
If you buy it
Stainless steel is durable and does not require replacement for material degradation. Wash regularly with mild soap and water; the vacuum seal is not damaged by normal dishwasher use, though hand washing extends lid lifespan. Do not expose to prolonged extreme heat (e.g., boiling water poured directly for extended periods) as this can affect the insulating vacuum seal integrity over years of use. No special storage or maintenance is required.
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.”
Stainless steel corrosion or metal leaching
Austenitic stainless steel (18/8) is resistant to corrosion under normal beverage use and does not leach nickel or chromium at pH-neutral conditions. No recalls or reported leaching issues for Reduce brand tumblers are on record.
Silicone or elastomer gasket degradation
Tumblers typically use silicone lids and seals. Silicone is generally low-toxicity, but repeated hot-liquid exposure or dishwasher cycling may cause minor plasticizer migration over years. This is not a safety flag for normal use but a durability consideration.
Coating or adhesive contamination from lid/handle assembly
If the lid or any grip elements contain epoxy adhesives or polyurethane coatings, these could theoretically off-gas VOCs or release BPA. No public testing or complaints specific to Reduce Slim Cold1 lids are established; material sourcing remains undisclosed by the brand.
Vacuum seal failure over time
Double-wall vacuum seals can gradually lose integrity with thermal cycling or damage, but this is a performance failure, not a safety hazard. Once failed, the tumbler functions as a regular insulator with no health risk.
Lead or cadmium in printed logos or decorative coatings
The Slim Cold1 features minimal exterior printing or coating. No regulatory violations or recalls for this product are documented. Standard industry practice among mid-market brands includes lead-free inks, but Reduce does not publicly confirm this.
What we don’t know
This grade is a model-based estimate from public materials, coatings, and brand disclosure at 72% 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 Insulated Drink Tumblers
Reduce
Halo Tumbler
Stainless steel and plastic lid
Lower concern tumbler; stainless steel is inherently PFAS-safe.
✓Naturally PFAS-free material
Cuppa
To Go Tumbler
Stainless steel with plastic lid
Lower concern. Standard tumbler with no known PFAS risks.
✓Naturally PFAS-free material
Klean Kanteen
Steel Pint
18/8 stainless steel, bare metal
Lower PFAS concern. Bare stainless steel container, no coatings.
✓Bare metal or glass, no coating at all
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.