Plantar Fascia Insole vs Propel + Carbon Performance Insoles: which is safer?
Spenco Plantar Fascia Insole is our pick: better on PFAS and on the overall hazard picture.
Our pick
Spenco
Plantar Fascia Insole
PFAS grade
Overall grade
Verdict
Hazard flags
Material
Confidence
PossibleVolatile Organic Compounds (VOCs) from foam off-gassing
PossibleMicroplastic shedding from foam degradation
PossibleAdhesive toxicity from foam-to-textile bonding
Spenco
Propel + Carbon Performance Insoles
PFAS grade
Overall grade
Verdict
Hazard flags
Material
Confidence
PossibleFormaldehyde resins in textile finishing
PossibleAzo dyes in textile coloring
PossiblePolyurethane foam degradation and off-gassing
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