Lunar Discovery w/ 1.39" HD Display Turn-by-Turn Navigation vs MG Navigator Band: which is safer?

WHOOP MG Navigator Band is our pick: better on PFAS and on the overall hazard picture.

boAt

Lunar Discovery w/ 1.39" HD Display Turn-by-Turn Navigation

PFAS grade

C 75/100

Overall grade

F 49/100

Verdict

Buy with care

Hazard flags

⚑ 5

Material

Electronic display device, unspecified coatings

Confidence

35%

PossibleDisplay coating (unidentified Teflon-family coating or hardener leachates)

PossibleAdhesive and sealant volatiles (display and casing assembly)

PossibleAluminum/alloy casing corrosion and ion leaching (skin contact)

Why this gradeBuy

Our pick

Whoop

MG Navigator Band

PFAS grade

B 85/100

Overall grade

D 69/100

Verdict

Buy

Hazard flags

⚑ 4

Material

Elastomer band (silicone-based or similar)

Confidence

72%

PossibleSilicone elastomer degradation and microparticle release

PossibleSkin irritation from contact allergens or residual processing chemicals

PossibleBacterial or fungal growth in band crevices

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