Stabilize Insole vs Propel + Carbon Performance Insoles: which is safer?

Reebok Stabilize Insole is our pick: better on PFAS and on the overall hazard picture.

Our pick

Reebok

Stabilize Insole

PFAS grade

D 65/100

Overall grade

F 53/100

Verdict

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Hazard flags

⚑ 3

Material

EVA foam, gel cushioning, textile cover

Confidence

70%

PossibleFormaldehyde resins in textile cover

PossibleAzo dyes in textile cover

PossibleMicrobial growth from moisture retention

Why this grade

Spenco

Propel + Carbon Performance Insoles

PFAS grade

D 65/100

Overall grade

F 45/100

Verdict

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Hazard flags

⚑ 5

Material

Foam cushioning, carbon layer, textile top

Confidence

72%

PossibleFormaldehyde resins in textile finishing

PossibleAzo dyes in textile coloring

PossiblePolyurethane foam degradation and off-gassing

Why this 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 synthetic athletic insoles & orthotics: see the full ranking