Halo Tumbler vs Slim Cold1 Tumbler: which is safer?
Reduce Halo Tumbler is our pick: better on PFAS and on the overall hazard picture.
Our pick
Reduce
Halo Tumbler
PFAS grade
A 100/100
Overall grade
A 92/100
Verdict
Buy
Hazard flags
⚑ 2
Material
Stainless steel and plastic lid
Confidence
72%
PossiblePlastic lid degradation and replacement
PossibleMicrobial growth in double-wall design
Reduce
Slim Cold1 Tumbler
PFAS grade
B 85/100
Overall grade
C 77/100
Verdict
Buy
Hazard flags
⚑ 2
Material
Stainless steel double-wall insulated tumbler
Confidence
72%
PossibleSilicone or elastomer gasket degradation
PossibleVacuum seal failure over time
Both products run through the same public rubric: materials, coatings, brand disclosure, lab findings, and recalls, plus a beyond-PFAS hazard analysis. Grades are model-based estimates, not lab tests. How grades work →
More insulated drink tumblers: see the full ranking