Microplastics
Material-class model assumption
Polyester is recorded as Synthetic and tied to Polyethylene terephthalate, which drives the material's microplastics score pressure.
Synthetic
Polyethylene terephthalate
What Is Polyester Fabric? Is It Safe to Wear?
Polyester is a synthetic fiber, usually polyethylene terephthalate (PET). The label tells you the disclosed fiber share. It does not tell you which dyes, catalyst residues, or water-repellent finishes were used, and it cannot prove that a garment contains or lacks PFAS.
Greener Closet scores a plain 100% Polyester label at 4/100. It is a synthetic fiber (polyethylene terephthalate), so the score counts it as a microplastic source. The label does not show which dyes or finishes were used, and those can change the score.
Where it shows up
Common in activewear, fleece, outerwear, and blends that need stretch, quick dry, or durability. Those performance traits are not a chemical-safety claim.
What the evidence supports
Polyester textiles can release plastic microfibers during washing, with amounts that vary by fabric and wash conditions. Some textile facilities use PFAS for water, grease, or stain resistance; that industry use does not mean every polyester garment has a PFAS finish.
What remains unknown
A public product page cannot establish a wearer's exposure or health outcome. Construction, finishes, and care change both shedding and any finish residues.
Primary sources
- Textile Fiber Rule (U.S. Federal Trade Commission)
- Release of synthetic microplastic plastic fibres from domestic washing machines: Effects of fabric type and washing conditions (Marine Pollution Bulletin)
- Per- and Polyfluoroalkyl Substances (PFAS) in Textile Mills (U.S. Environmental Protection Agency)
- Our Current Understanding of the Human Health and Environmental Risks of PFAS (U.S. Environmental Protection Agency)
Reviewed 2026-09-05.
How the model interprets this fiber
MaterialsDB records polyester as a synthetic microplastic source and applies default persistence, shedding, and PFAS-association penalties. These are model assumptions, not lab results for a finished SKU.
Very high concern
PFAS uncertainty
Material-class model assumption
Polyester receives a PFAS uncertainty penalty because performance synthetics and finish-dependent uses can make PFAS claims harder to verify from a label alone.
Half-life and biodegradability
Material-class model assumption
Polyester is treated as slow to break down, so half-life and biodegradability are major sustainability concerns.
Fiber shedding
Material-class model assumption
Polyester can shed fibers during wear and washing; the MaterialsDB shedding penalty captures that release risk.
Manufacturing energy
Material-class model assumption
Polyester carries a manufacturing-energy penalty, so production impacts remain part of the score even when microplastic risk is low.
Other fibers to compare
Best next step
Paste the full fabric label into the homepage checker. A 95% cotton, 5% elastane garment will not score the same as 100% cotton, and the checker handles those percentages.
Use the material-label checkerRelated scored products
439 visible scored products include Polyester.
Luna Stretch Slim Straight Jeans
Quince
90/100
Women'sPants
Men's Athletic Ankle Socks 8 Pairs Thick Cushioned Cotton for Casual
WANDER
89/100
Men'sSocksActivewear
American Vintage Unisex Pullover
American Giant
79/100
UnisexSweatshirts
Straight Athletic Fit Jeans
Barbell Apparel
77/100
Men'sPants
Slim Athletic Fit Jeans
Barbell Apparel
77/100
Men'sPants
Saige High Waist Raw Hem Wide Leg Jeans
AG
76/100
Women'sPants
Men's Merino Wool Blend Ankle Sock 4-Pack
Bombas
74/100
Men'sSocks
AE Slim Straight Jean
American Eagle
74/100
Men'sPants
Category guides where Polyester shows up
Polyester is on the look-for or watch-out list for these categories. Each guide ranks scored products and explains what the fiber label can tell you.
Common questions
Does Polyester clothing shed microplastics?
Polyester is listed in MaterialsDB with Polyethylene terephthalate. That is a default scoring input for microplastic shedding, not a lab result for every finished garment.
Is Polyester biodegradable?
Polyester carries a half-life penalty in MaterialsDB, meaning persistence and biodegradability are important concerns.
How should I check a Polyester blend?
Use the Greener Closet material-label checker with the full percentage label, because blends can change the final score even when Polyester is only one part of the garment.