The usual better tradeoff, not a natural fiber
This is not a list of plant or animal fibers. It is the synthetic feedstock that usually ranks higher inside a category that is almost entirely synthetic.
Swimwear
Scored swimwear, ranked by disclosed materials
There is no widely available cotton bikini that behaves like swimwear. This page ranks the suits we have scored, which are mostly polyester or nylon, and treats water-repellent finishes as a PFAS question rather than pretending a plant-fiber swap is on the rack.
Recycled polyester is still polyester for shedding. The usual “better” pick in this category is a recycled-poly suit without a DWR story, not a claim that the suit is PFAS-free.
Highest-scoring swimwear we have analyzed
23 visible scored products match this category.
Women's Pointelle French Cut Bikini - 100% Organic Cotton
Q for Quinn
97/100
Women'sUnderwear
Womens Everyday Bikini - Natural, Plant Dyes - 100% Organic Cotton (2 pack)
Q for Quinn
97/100
Women'sUnderwear
Organic One Piece Swimsuit
BeachCandy
95/100
Women'sSwimwearOne-Pieces
BIKINI BRIEF
Mighty Good Basics
93/100
Women'sUnderwear
Organic Everyday Classic Fit Bikini 6-Pack
Pact
93/100
Women'sUnderwear
Organic Handkerchief Bikini Top
BeachCandy
92/100
Women'sSwimwear
Organic Cotton Low-Rise Bikini
Subset
91/100
Women'sUnderwear
Organic Comfort Mid Rise Bikini
MATE the Label
91/100
Women'sUnderwearSwimwear
CENTRAL PARK 100% Organic Hemp Running Fitness Beach Shorts (Lined; 2 Side Pockets; 100% Biodegradable Organic Elastic Option)
Rawganique
87/100
UnisexShortsActivewearSwimwear
Organic Everyday Classic Fit Bikini
PACT
85/100
Women'sUnderwear
Everyday Classic Fit Bikini 5-Pack
Pact
85/100
Women'sUnderwear
SAUCY TOP
NATASHA TONIC
85/100
Women'sSwimwear
Everyday Classic Fit Bikini
Pact
83/100
Women'sUnderwear
PRISM BIKINI BOTTOM, TAN COLOR
NATASHA TONIC
82/100
Women'sSwimwear
Youth Athletic Apparel
Athleta
81/100
KidsShirtsPantsSwimwear
MONET 100% Organic Cotton Knit Boxer Shorts (No Fly, OC Thread, Lounge & Beachwear) (V2 100% Biodegradable)
Rawganique
81/100
Men'sUnderwearSwimwearShorts
Wealurre Cotton Bikini Women's Breathable Panties Seamless C
Wealurre
77/100
Women'sUnderwear
Bamboo Cotton Women's Basics Bikini Underwear (2 Pack)
Nest Designs
75/100
Women'sUnderwear
Women's Basics Bikini Underwear (2 Pack)
Nest Designs
75/100
Women'sUnderwear
Women's Super Soft String Bikini 3-Pack
Bombas
70/100
Women'sUnderwear
Bikini
huha
69/100
Women'sUnderwear
KNITLORD Women's Underwear Cotton or Viscose Soft Bikini Pan
KNITLORD
66/100
Women'sUnderwear
Period & Leak Proof - Hipster Bikini - Light
Boody
60/100
Women'sUnderwear
What to check on a swimwear label
- Expect polyester, nylon, and elastane. That is the category, not a defect in the listing.
- Recycled polyester can be the higher-scoring feedstock among those synthetics. It does not stop microfiber shedding in water or in the wash.
- “Quick-dry,” “water-repellent,” or “UV finish” language is a prompt to look for product-specific chemistry. Swimwear is one of the categories most often flagged for PFAS-based DWR. Missing evidence means unknown.
Why this category is mostly tradeoffs
Swimwear is one of the categories most consistently flagged for PFAS-based water-repellent finishes. It is also one of the highest microplastic-shedding garments. Recycled-polyester swimwear without DWR finishes is usually the better tradeoff in the catalog we have, not a natural-fiber alternative.
- PolyesterVirgin polyester is the default swimsuit fiber and a high-shedding one. Recycled polyester is the usual comparison, not cotton.
- NylonCommon in swim knits. Same synthetic shedding family as polyester for this ranking.
- ElastaneWhat makes a suit stretch. Expected in almost every piece; the score question is how much of the rest is nylon or polyester.
Have a specific item in mind?
Paste the product URL into the analyzer or paste the fabric label into the homepage checker. Both work without an account.
Swimwear questions
Why aren’t cotton or wool on the “look for” list?
Because they are not how almost any swimsuit is made. Putting them on this page would imply a swap that shoppers cannot make. The honest comparison is among polyester, recycled polyester, nylon, elastane, and whatever finish the listing discloses.
Is recycled-polyester swimwear PFAS-free?
Not because it is recycled. PFAS questions attach to water-repellent and similar finishes. We only use a PFAS-free or fluorine-free statement when it is product-specific and says what it covers.
How do you score swimwear?
Each product starts at 100 and is scored from its disclosed material composition and available certification information. Material-level penalties across six factors are combined in proportion to the stated fiber blend. The score compares available evidence. It is not a medical or product-safety certification. The methodology page has the details.