Chlorine Resistance & UV Protection: Essential Features for Professional Swimwear.
Mar 18, 2026
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Why Chlorine Resistance Matters in Swimwear Production
Chlorine degrades elastane fibers.
In standard swimwear fabrics, exposure to chlorinated water leads to:
·Loss of elasticity
·Fabric sagging
·Reduced recovery performance
·Shortened garment lifespan
For brands selling into competitive retail channels, this leads to:
·Higher return rates
·Negative product reviews
·Reduced repeat orders
From a manufacturing perspective, chlorine resistance is not optional for professional swimwear.
What Is Xtra Life Lycra® and Why It Matters
Xtra Life Lycra® is an advanced elastane fiber engineered to resist chlorine degradation.
Compared with standard elastane, it provides:
·Up to 10x longer resistance to chlorine damage
·Improved shape retention
·Reduced bagging and sagging
·Extended product lifespan
Typical fabric composition:
·80–82% Nylon / 18–20% Xtra Life Lycra®
This fiber is widely used in:
·Competitive swimwear
·Premium resort swimwear
·Long-life training swimwear
For brands, the cost increase is justified by improved durability and stronger product positioning.
UV Protection: A Key Requirement in US & Australian Markets
Swimwear sold in outdoor-heavy markets must meet UV protection standards.
Australia and parts of the US have high UV exposure levels.
Retailers increasingly require fabrics with UPF (Ultraviolet Protection Factor) ratings, typically:
·UPF 30+ (good protection)
·UPF 50+ (excellent protection)
UV protection is achieved through:
·Fabric density (higher GSM)
·Fiber composition
·Dyeing and finishing treatments
Low GSM fabrics may not meet UV protection requirements.
Fabric Engineering for UV Protection
UV protection is not a label claim. It must be engineered into the fabric.
Key technical factors include:
GSM Control
Higher GSM improves UV blocking performance.
Typical swimwear fabric ranges:
Standard fabrics: 180–200 GSM
UV-protective fabrics: 200–230 GSM
Higher GSM increases:
Fabric opacity
UV resistance
Material cost
Factories must balance performance with FOB pricing.
Dyeing and Finishing
Dark colors provide better UV absorption.
However, dyeing must maintain:
Color Fastness Grade ≥ 4
Resistance to chlorine and saltwater
Poor dyeing leads to fading after exposure.
Fabric Construction
Tighter knitting structures reduce UV penetration.
Warp-knit fabrics (e.g., tricot) perform better than loose circular knits.
Chlorine Resistance vs Standard Fabric Performance
Below is a factory-level comparison.
| Typical Type | Typical GSM | Cost Index | Cost Index | MOQ |
| Standard Nylon Spandex | 180–200 GSM | Low | Moderate | 3000 pcs |
| Xtra Life Lycra® Fabric | 190–220 GSM | Medium-High | Very High | 3000 pcs |
| Xtra Life Lycra® Fabric | 180–200 GSM | High | High | 3000-5000 pcs |
Xtra Life Lycra® fabrics maintain elasticity significantly longer under chlorine exposure.
Quality Control for Functional Swimwear Fabrics
Functional fabrics require stricter quality control procedures.
At Reely Apparel, testing includes:
Incoming Fabric Inspection
GSM verification
Stretch and recovery testing
Color Fastness testing (wash, chlorine, UV exposure)
Fabric defect inspection
Chlorine Resistance Testing
Fabric samples are exposed to controlled chlorine environments.
We evaluate:
Elastic recovery after exposure
Surface degradation
Color fading
UV Protection Testing
Fabric is tested for UPF rating using standard lab equipment.
Only fabrics meeting target UPF levels proceed to production.
Production Considerations for Functional Swimwear
Using advanced fabrics affects manufacturing processes.
Sewing Adjustments
High-elastane fabrics require:
Specialized needles
Controlled stitch density
Reinforced seams
Incorrect sewing parameters can damage elastic fibers.
Pattern Development
Functional fabrics behave differently under tension.
Pattern engineers must adjust:
Stretch allowance
Seam placement
Panel shaping
This ensures garments maintain shape after repeated use.
Shrinkage Control
Shrinkage must remain within acceptable limits:
Target shrinkage rate ≤ 3%
Fabric finishing processes must stabilize the material before cutting.
Lead Time and Cost Implications
Functional fabrics require additional sourcing and testing time.
Typical timeline:
Fabric sourcing: 10–15 days
Testing and approval: 5–7 days
Sampling: 7–10 days
Bulk production: 25–35 days
Compared with standard fabrics, Lead Time may increase by 3–5 days.
Cost impact:
Fabric cost increases by 15–30%
Testing adds minor overhead
Overall FOB price increases depending on fabric selection
However, performance fabrics reduce long-term product failure rates.
Compliance Requirements for US & EU Markets
Buyers increasingly request documentation for:
Fabric composition
UPF rating reports
Color Fastness test results
Production quality reports under AQL 2.5 standards
Factories must provide traceable testing data.
Without documentation, products may fail retailer onboarding.
Why Functional Fabrics Define Premium Swimwear
Basic swimwear competes on price.
Functional swimwear competes on performance and durability.
Brands using chlorine-resistant and UV-protective fabrics gain:
Higher retail price positioning
Reduced return rates
Stronger brand credibility
Better long-term customer retention
For OEM manufacturers, the challenge is ensuring these features are scalable across bulk production.
Work With a Factory That Understands Performance Fabrics
At Reely Apparel, functional swimwear is developed with full engineering control.
Our capabilities include:
Sourcing Xtra Life Lycra® and UV-protective fabrics
GSM verification and shrinkage rate testing
Lab testing for Color Fastness and chlorine resistance
Production under AQL 2.5 quality control standards
Transparent MOQ and Lead Time planning
If you are targeting the US or Australian market, your fabric choice will define your product success.
Submit Your Swimwear Tech Pack for Evaluation
If you are developing a professional swimwear line:
Send us your Tech Pack for feasibility review
Request fabric swatches with chlorine and UV test reports
Get a detailed FOB quotation based on your specifications
Evaluate MOQ and Lead Time before sampling
Contact Reely Apparel today to build a swimwear program engineered for performance and compliance.