This article was originally published in 2016. It has been updated in 2026 to reflect current knowledge and industry practices around recycled and regenerated textile fibres.
IS RECYCLED POLYESTER SUITABLE FOR SWIMWEAR?
Recycled polyester has become one of the most widely used materials in contemporary swimwear and sportswear. Derived primarily from post-consumer PET bottles, it offers a way to reuse existing plastic waste while maintaining many of the performance properties that made polyester popular in the first place.
However, suitability is not only about performance or marketing claims. It requires a closer look at material behaviour, environmental trade-offs, and long-term use.
POLYESTER: PROPERTIES AND LIMITATIONS
Polyester is a synthetic fibre developed in the mid-20th century and is now used across multiple industries, from packaging to technical textiles. In garments, its key characteristics include:
- High durability and abrasion resistance
- Dimensional stability (low shrinkage and stretch)
- Fast drying and moisture resistance
These properties make polyester attractive for swimwear and active garments. However, durability alone does not determine sustainability.
VIRGIN VS. RECYCLED POLYESTER
Recycled polyester is typically produced by mechanically or chemically recycling PET waste into new fibres. While this reduces dependence on virgin fossil resources, the fibre itself remains chemically identical to conventional polyester.
From a functional perspective, recycled polyester performs similarly to virgin polyester. The difference lies mainly in resource input, not in fibre behaviour during use.
MICROPLASTICS: A TECHNICAL REALITY
One of the most discussed issues around polyester — recycled or not — is microplastic shedding. During washing, synthetic fibres can release microscopic particles that enter wastewater systems and eventually natural environments.
Recycling does not eliminate this issue. It is an inherent property of polyester-based fibres and should be considered when evaluating material choices for long-term sustainability.
FROM RECYCLED TO REGENERATED: WHAT CHANGES?
This is where terminology matters.
- Recycled fibres are reprocessed but remain the same polymer
- Regenerated fibres are chemically broken down to their base components and rebuilt into new polymer chains
This distinction is crucial.
ECONYL® AND REGENERATED NYLON EXPLAINED
Econyl® is a regenerated nylon (polyamide) produced through a depolymerisation process. Waste materials such as discarded fishing nets and industrial nylon waste are chemically broken down and reconstructed into new nylon yarn.
- High strength and elasticity
- Long service life
- Suitability for repeated use and demanding conditions
Unlike recycled polyester, regenerated nylon restores the polymer structure, allowing repeated regeneration without the same degradation cycle.
RECYCLED VS. REGENERATED: THE KEY DIFFERENCE
The main difference is not aesthetics or branding — it is material chemistry.
- Recycled polyester reduces waste but remains a single-use polymer cycle
- Regenerated nylon enables a more circular material system
- Both have environmental costs, but their long-term potential differs
Understanding this difference is essential when designing garments intended for durability, performance, and extended life cycles.
MATERIAL CHOICE IN PRACTICE
There is no universally “perfect” material. Each fibre choice involves trade-offs between performance, longevity, environmental impact, and intended use.
For garments exposed to high stress, movement, and repeated wear — such as swimwear or workwear — regenerated fibres can offer advantages in durability and lifecycle potential.
HOW THIS RELATES TO WORKWEAR AND PERFORMANCE TEXTILES
The same principles apply beyond swimwear. In workwear and technical garments, material decisions should be based on function, lifespan, and realistic use conditions, not simplified sustainability labels.
This is why material literacy matters — and why recycled and regenerated fibres should never be treated as interchangeable terms.
Internal link suggestion: Workwear Textiles hub
ECONYL® AND SUSTAINABLE SWIMWEAR IN PRACTICE
Sustainable swimwear is not only about visual appeal or environmental messaging. It is about choosing materials that perform under stress, last over time, and reduce reliance on virgin resources.
At ZLCOPENHAGEN, regenerated nylon made with Econyl® is used as a material solution where durability, elasticity, and repeated use are critical requirements.
WHY MATERIAL CHOICE MATTERS IN SWIMWEAR
Swimwear is exposed to salt water, chlorine, UV radiation, and constant movement. These conditions place high demands on fibre structure and fabric recovery.
Regenerated nylon offers:
- High tensile strength and elasticity
- Resistance to deformation over time
- Suitability for repeated wear and washing
This makes it particularly relevant for garments designed for long-term use rather than short fashion cycles.
FROM WASTE TO FUNCTIONAL MATERIAL
Econyl® regenerated nylon is produced through a depolymerisation process that transforms nylon waste — such as discarded fishing nets and industrial residues — back into its original polymer structure.
This process allows the material to be regenerated without the same quality loss associated with conventional mechanical recycling.
BEYOND MARKETING: REALISTIC EXPECTATIONS
While regenerated fibres reduce the need for virgin raw materials, they are not impact-free. Energy use, chemical processing, and infrastructure all play a role in the overall footprint.
Material choice should therefore be evaluated based on realistic performance needs, lifespan, and use conditions — not simplified sustainability claims.
APPLICATIONS BEYOND SWIMWEAR
The same material principles apply to other performance-driven garments, including workwear and technical apparel. In these contexts, fibre longevity and functional stability often outweigh short-term aesthetic considerations.
Internal link suggestion: Workwear Textiles hub
MAKING INFORMED MATERIAL DECISIONS
Sustainable design is not about choosing a single “perfect” fibre. It is about understanding trade-offs and selecting materials that align with intended use, durability expectations, and realistic lifecycle scenarios.
Regenerated nylon is one such option — not a universal solution, but a material with clear advantages when used in the right context.
RECYCLING IN TEXTILES: WHAT IT ACTUALLY MEANS
Recycling plays an important role in reducing waste and limiting the use of virgin raw materials. In textiles, however, recycling should be understood as a material strategy rather than a universal solution.
- RECYCLED MATERIALS ARE NOW STANDARD
Recycled fibres are widely used across fashion, sportswear, and technical textiles. Their presence reflects improved waste collection and processing systems, not necessarily superior material performance. - RECYCLING REDUCES RESOURCE EXTRACTION
Using recycled input can lower dependence on virgin fossil resources. The primary benefit lies in resource efficiency, while fibre behaviour often remains unchanged. - RECYCLED TEXTILES STILL HAVE LIMITATIONS
Mechanical recycling can shorten fibre length and affect durability. Recycling does not automatically resolve issues such as microplastic release or end-of-life disposal. - RECYCLING IS ONE TOOL — NOT THE END GOAL
Long-term sustainability depends on material lifespan, garment use, and realistic recycling pathways. Recycling should support durability, not replace it.
In textile design, the most effective environmental impact often comes from making products last longer, rather than relying solely on recycled inputs.
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