APEX 4 (42mm) - White touch screen GPS Watch with Kilian Jornet Nylon Band vs Peak Health and Fitness Wearable 12-Month Membership: which is safer?

WHOOP Peak Health and Fitness Wearable 12-Month Membership is the clear pick. COROS APEX 4 (42mm) - White touch screen GPS Watch with Kilian Jornet Nylon Band carries a failing PFAS grade, and we never recommend buying a failing product.

Coros

APEX 4 (42mm) - White touch screen GPS Watch with Kilian Jornet Nylon Band

PFAS grade

F 40/100

Overall grade

F 18/100

Verdict

Skip

Hazard flags

⚑ 2

Material

Stainless steel case, nylon band, sapphire touch screen

Confidence

35%

LikelyPFAS in water-resistant treatments (band/seals)

PossibleStainless steel nickel leaching

Why this grade

Our pick

Whoop

Peak Health and Fitness Wearable 12-Month Membership

PFAS grade

B 85/100

Overall grade

C 77/100

Verdict

Buy

Hazard flags

⚑ 2

Material

silicone band, electronics, stainless steel hardware

Confidence

72%

Possiblesilicone degradation and skin irritation

Possiblebacterial or fungal growth on band

Why this gradeBuy

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 fitness trackers: see the full ranking