Reversible Seamless Sports Bra vs Ultimate Support Non Wired Sports First Bra: which is safer?

Marks & Spencer Reversible Seamless Sports Bra is our pick: better on PFAS and on the overall hazard picture.

Our pick

Marks & Spencer

Reversible Seamless Sports Bra

PFAS grade

D 65/100

Overall grade

F 49/100

Verdict

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Hazard flags

⚑ 4

Material

Nylon blend with elastane, seamless construction

Confidence

72%

PossibleAzo dyes (colorants)

PossibleFormaldehyde resins (finishing agents)

PossibleElastane degradation and microfiber shedding

Why this grade

Marks & Spencer

Ultimate Support Non Wired Sports First Bra

PFAS grade

F 20/100

Overall grade

F 0/100

Verdict

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Hazard flags

⚑ 3

Material

Polyamide, elastane with likely water-repellent coating treatment

Confidence

45%

PossibleAntimony in polyester/polyamide

LikelyMicroplastic shedding

LikelyElastane degradation and wear particles

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 sports bras: see the full ranking