Swimwear Manufacturer for $20M to $500M Brands
Swim bottoms, one-pieces, board shorts, and accessories from a partner that treats chlorine, UV, and PFAS-free finishing as the real quality bar, not the marketing tab.
Ohzehn is a vertically integrated swimwear manufacturer running four factories in Fuzhou, China, producing swim bottoms, one-pieces, board shorts, and swim accessories for brands including Skims, Victoria's Secret, Calvin Klein, and Tommy Hilfiger. Full-package and CMT, OEKO-TEX Standard 100 Class II, PVH-accredited in-house testing including colorfastness to sea water, PFAS-free coatings and finishing, and plant-derived OHZEHN-TEX™ swim blends for brands moving beyond conventional polyester-elastane.
What should a $20M to $500M swim brand demand from a manufacturer?
A lab that tests colorfastness and stretch retention on every production batch, not just at fabric approval, against the exposures swim actually lives in: pool chemistry, salt water, and sun. A PFAS-free water-repellent finish that is a process default, not a workaround. Dye fastness tuned for that exposure profile, not just wash cycles. And a partner with a real alternative to conventional polyester-elastane on the sustainability tier, because swim is where consumer scrutiny of polyester and microplastic shedding lands hardest.
The brands we work with in swim came to us for one of two reasons. Their old supplier could not hold color through a real season of chlorine and sun, so the product looked tired by August and returns spiked. Or they wanted a plastic-free capsule to sit above their recycled polyester core and their supplier had nothing beyond one recycled fabric to offer.
Why does vertical integration matter for swim?
Because swim fabric is where mill quality control decides warranty and returns. A single bad dye batch in a swim collection ages six weeks after launch, on the customer's Instagram, and the whole line takes the hit. When knit, dye, cut, and sew answer to the same operations owner, the UV and chlorine bar is set once against a documented lab method and held across every batch of the season. When they answer to different owners, one bad mill run ends the story.
Ohzehn runs four factories in Fuzhou as one group. My co-founder JJ Chen runs operations on the factory side; I run the brand side from the US. You get both ends of that in your corner. The margin move for scaling swim brands consolidating from a fragmented supply base tends to show up first in return rate, then in per-unit cost.
What actually sets your MOQ and lead time in swim?
Fabric weight and dye-fastness math set the floor, not the sewing line. Here is where the floor actually comes from, stage by stage, and what to ask any manufacturer at each one:
| Production stage | What sets the floor | What to ask any manufacturer |
|---|---|---|
| Swim knit + dye | The dye lot minimum per color. Swim-grade knits run heavier fabric weights and a tighter color window than jersey, so the lot is less forgiving | Whether colorfastness is tested per production batch or only at fabric approval, and against which exposures |
| Knit swim cut-and-sew | Cup construction and lining complexity. Molded and cut-and-sew cups plus full linings run at lower throughput than unlined knitwear | How shell, lining, and elastic shade-match inside one garment, and who owns that approval |
| Board shorts + woven | Woven minimums plus water-repellent finishing, which runs as its own stage on top of dye | Which DWR chemistry is used and for the PFAS-free documentation behind it |
| Sublimation, print + trim | Print run minimums per artwork, then hardware and trim consolidation | How many trim and hardware SKUs are consolidated in-house versus bought through agents |
| Ohzehn (integrated) | Fabric, dye, finishing, sew, and lab answer to one owner across four Fuzhou factories | Ask us how the MOQ is built. Sharing a swim base across styles is where your dye-lot dollar hides |
Swim dye-lot commitment is heavier than activewear because the fabric weight is higher and the dye-fastness window is tighter. Sharing a swim base across two bottoms and a one-piece stretches the dye-lot dollar and gives the collection its color story without buying every colorway separately.
Which certifications actually protect a swim program?
The ones with verifiable numbers held by the factory, not borrowed from a mill certificate. Our stack:
- OEKO-TEX Standard 100, Product Class II. Direct-skin-contact class. Covers pH, formaldehyde, extractable heavy metals, allergenic dyes, and organotins on the finished swim fabric.
- GRS (Global Recycled Standard) v4.0, Control Union verified. Chain-of-custody audit for recycled polyester and regenerated nylon programs where the swim story leans on recycled content.
- ZDHC membership. Wastewater and input-chemistry management to the Zero Discharge of Hazardous Chemicals framework.
- SAC membership. Higg-based facility reporting, the vendor-onboarding format major retailers request.
- PVH-accredited in-house testing lab. Our lab is accredited by PVH, parent of Calvin Klein and Tommy Hilfiger. AATCC and ISO methods run on every production batch. For swim: colorfastness to sea water (AATCC 106) and water (AATCC 107), accelerated laundering (AATCC 61), perspiration (AATCC 15), rubbing wet and dry (AATCC 8), pH (AATCC 81), stretch and recovery (ASTM D4964), and dimensional stability (AATCC 135).
- Bureau Veritas third-party verification. Independent verification on top of the in-house lab.
Every certificate above has a number we hand over before any commercial commitment. If a manufacturer you are evaluating hesitates on that, that is your answer.
Can you build plastic-free swim at production scale?
Yes, and swim is where the plastic-free premium story lands hardest at retail, because the customer is deep in the exact concern that puts polyester on the defensive: microplastic shedding into ocean water while she wears it. Alongside conventional polyester-elastane and recycled polyester swim, Ohzehn develops OHZEHN-TEX™ swim blends, a 99.5 percent plant-derived platform built on castor oil polyamide and corn-derived stretch. The platform clears OEKO-TEX Standard 100 Class II, is PFAS-free by design, and is tested in-house for colorfastness to sea water (AATCC 106) and stretch and recovery (ASTM D4964) batch by batch. Full material logic is in our plastic-free performance guide.
Operationally, you run your GRS-backed recycled polyester core for volume and a plant-derived capsule for the premium tier of the collection. Same partner, same lab, same delivery calendar.
How 2026 compliance is changing swim sourcing
PFAS bans in California (AB 1817), New York (S6291A), and a growing state list eliminate legacy fluorinated DWR chemistries as a swim finishing option in the US market. Our production is PFAS-free with a documented water-repellent finish alternative, and we run REACH, SVHC, POP, and GB 18401 compliance across the swim program. Full regulatory tracker at PFAS Clothing Ban 2026.
How do you vet us before committing a swim season?
Paper, people, product. Ask for the swim spec pack and verify the certificate numbers in the issuer databases. Get on a call with me and JJ and ask the operational questions your last supplier failed on: batch testing cadence for color and stretch, PFAS-free finish documentation, dye-lot color window under real pool chemistry. Then run a development package. We sample. You put the pieces through a real wear, wash, pool, and sun test. Nobody commits to a season until samples and paperwork earn it. More on Ohzehn Group if you want the corporate structure and history before the call.
Frequently asked questions
Can plant-derived fabric actually survive chlorine and UV?
Yes, when the platform is engineered for it. OHZEHN-TEX™ swim blends are built on castor oil polyamide and corn-derived stretch, developed against the same bar conventional swim fabric has to clear: hold color and stretch through pool chemistry, salt water, and sun. Colorfastness to sea water (AATCC 106) and stretch and recovery (ASTM D4964) run in-house batch by batch, and the pool-and-ocean question is exactly what the development package puts your own samples through before you commit a season.
What MOQ can a scaling swim brand realistically get?
The dye lot sets the floor, not the sewing line. Swim carries heavier dye-lot commitments than jersey because the fabric weight is higher and the color window under UV and chlorine is tighter, and every added colorway multiplies the fabric side. Ohzehn knits, dyes, and finishes in-house across four Fuzhou factories, so minimums flex across styles that share a fabric base. Sharing one swim base across two bottoms and a one-piece is the single best MOQ lever. Ask any manufacturer how the MOQ is built, not just what it is.
Why is swim fabric so much more expensive than activewear fabric?
Because swim fabric has to pass a chemistry stress test that activewear does not. It has to hold color under UV, hold stretch under chlorine, and reject water without PFAS. That means finer yarn, tighter knit density, a higher dye-fastness bar, and PFAS-free water-repellent finishes that cost more than legacy C6 or C8 chemistries. It is real cost, not markup, and it is why a swim program is priced off the fabric spec, not the garment silhouette.
What certifications matter most for swimwear in 2026?
OEKO-TEX Standard 100 at Product Class II covers direct-skin-contact substances. PFAS-free documentation covers the California AB 1817 apparel ban and the growing state list. GRS covers recycled-content claims where a brand uses regenerated nylon or recycled PET. Ohzehn holds all three plus ZDHC for wastewater, SAC for Higg reporting, and PVH accreditation on the in-house testing lab, and every certificate has a verifiable number we hand over before any commercial commitment.
Can Ohzehn produce recycled and plant-derived swim in the same season?
Yes. Most swim brands in this cohort now run a recycled polyester or regenerated nylon core program and a smaller premium capsule where a plastic-free story earns a real retail premium. Ohzehn produces both on the same PVH-accredited quality system, the same delivery calendar, and the same lab file. The recycled program covers the volume story on your GRS-backed hangtag, and the OHZEHN-TEX capsule covers the plastic-free story on your press page.