Helio Strap Fitness Tracker vs Juice Pack Case for iPhone 17 Pro Max: which is safer?
mophie Juice Pack Case for iPhone 17 Pro Max is our pick: better on PFAS and on the overall hazard picture.
Amazfit
Helio Strap Fitness Tracker
PFAS grade
Excellent 85/100
Overall grade
Good 55/100
Verdict
Buy with care
Hazard flags
⚑ 4
Material
Rubber/silicone strap, elastomer band
Confidence
45%
PossibleSilicone degradation and particulate shedding
LikelyBacterial colonization in band crevices
PossibleContact allergens or residual processing chemicals
Our pick
Mophie
Juice Pack Case for iPhone 17 Pro Max
PFAS grade
Excellent 85/100
Overall grade
Excellent 81/100
Verdict
Buy
Hazard flags
⚑ 1
Material
Plastic housing
Confidence
45%
PossibleMicroplastics from case degradation
Where these two actually differ
- We flag Silicone degradation and particulate shedding, Bacterial colonization in band crevices, Contact allergens or residual processing chemicals and Moisture trapping and skin maceration on the Amazfit and not on the Mophie.
- We flag Microplastics from case degradation on the Mophie and not on the Amazfit.
- The Amazfit is Rubber/silicone strap, elastomer band where the Mophie is Plastic housing, which is most of the difference in these two grades.
- These two are level, close enough that price and fit should decide it rather than our grade.
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 waterproof smartphone cases: see the full ranking