Reversible Seamless Sports Bra vs Second Skin Gel Sports 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
Skip
Hazard flags
⚑ 4
Material
Nylon blend with elastane, seamless construction
Confidence
72%
PossibleAzo dyes (colorants)
PossibleFormaldehyde resins (finishing agents)
PossibleElastane degradation and microfiber shedding
Marks & Spencer
Second Skin Gel Sports Bra
PFAS grade
F 20/100
Overall grade
F 6/100
Verdict
Skip
Hazard flags
⚑ 2
Material
nylon elastane blend with moisture-wicking gel coating
Confidence
35%
PossibleCoating degradation and skin contact
ReportedElastane degradation under UV and chlorine
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