Sense Smartwatch 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.
Fitbit
Sense Smartwatch
PFAS grade
Excellent 85/100
Overall grade
Good 63/100
Verdict
Buy
Hazard flags
⚑ 4
Material
Aluminum, stainless steel, rubber
Confidence
35%
PossibleRubber band skin contact and additives
ReportedBacterial and fungal growth on rubber and crevices
PossibleAluminum oxidation and surface degradation
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 Rubber band skin contact and additives, Bacterial and fungal growth on rubber and crevices, Aluminum oxidation and surface degradation and Allergic reaction to stainless steel or nickel content on the Fitbit and not on the Mophie.
- We flag Microplastics from case degradation on the Mophie and not on the Fitbit.
- The Fitbit is Aluminum, stainless steel, rubber 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