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Non-toxic swimwear for kids is becoming a growing area of interest as parents look more closely at the materials used in clothing that sits directly against their child’s skin.
Most children’s swimsuits are made from synthetic blends like nylon, polyester, and elastane, chosen for their stretch, durability, and resistance to chlorine and sunlight.
Achieving these properties typically involves chemically processed fibers, dyes, and finishing treatments that are not always disclosed at the product level.
This does not necessarily mean conventional swimwear is unsafe, but it does raise questions about how these materials behave under real-world conditions.
Swimwear is worn tightly against the skin, often while wet and exposed to heat, which can influence how textile residues interact with the body over time.
In this guide, we examined the materials used in kids’ swimwear, what research suggests about textile exposure, and which brands stand out for using certified fabrics, lower-impact dyes, or reduced chemical treatments compared with conventional options.
At A Glance, Breakdown of Non-Toxic Kids’ Swimsuits
| Brand | Materials | Certifications | Key Safety Angles | Price |
|---|---|---|---|---|
| Hanna Andersson | 80% Recycled Nylon | 20% Spandex | OEKO-TEX Standard 100 | Certified Fabrics | Chlorine-Resistant Durability | $50+ |
| Reima | Recycled Polyester | Polyamide Blends | Bluesign-Approved Materials | Advanced Chemical Management | EU Standards | $35+ |
| Pure Earth Collection | 98% Organic Cotton | 2% Lycra | Organic Materials | PFAS-Free Components | Minimal Synthetic Content | Non-Toxic Dyes | £46+ |
| Seaesta Surf | 52% Organic Cotton | 48% Recycled Polyester | OEKO-TEX Low-Impact Dyes | Reduced Synthetic Content | Simplified Trims | $54+ |
| Little Green Radicals | 82% Recycled Nylon | 18% Spandex | OEKO-TEX Standard 100 | Certified Recycled Fabrics With Transparency | $32+ |
| Esembly | Recycled Polyester | TPU | OEKO-TEX | GRS | Free From BPA, PVC, Phthalates & Lead | $18 |
Materials Commonly Used in Children’s Swimwear
Most children’s swimwear is constructed from synthetic fiber blends engineered for elasticity, durability, and resistance to water exposure. The most common materials include nylon (polyamide), polyester, and elastane (spandex or Lycra).
These fibers are not inherently interchangeable. Each plays a specific role in how swimwear performs under stress from chlorine, saltwater, and UV radiation.
Nylon (Polyamide)
Nylon is one of the most widely used materials in swimwear due to its lightweight structure, smooth texture, and high elasticity when blended with elastane.
From a manufacturing perspective, nylon is a petroleum-derived polymer produced through chemical synthesis.
During textile processing, it is often combined with:
- Dye stabilizers
- Softening agents
- UV-resistant treatments
Nylon-based fabrics are typically favored for their comfort and flexibility, but like all synthetic polymers, they may involve residual processing chemicals depending on manufacturing standards.
Polyester
Polyester is another common base material, often used for its durability and resistance to stretching or shrinking over time.
Compared to nylon, polyester tends to be more resistant to chlorine degradation, which is why it is frequently used in performance swimwear.
However, polyester is also a plastic-based fiber, and research has identified it as a contributor to microfiber shedding during washing and wear. These microfibers can enter wastewater systems and persist in aquatic environments.
In children’s swimwear, polyester is often blended with elastane to improve flexibility.
Elastane (Spandex / Lycra)
Elastane is the component responsible for stretch and shape retention. Even small percentages (typically 5–20%) significantly change how a swimsuit fits and performs.
Elastane fibers are highly engineered polymers that allow fabrics to stretch and return to their original shape. However, they are also among the least stable fibers under prolonged exposure to chlorine and heat, which can lead to gradual breakdown over time.
Because elastane is almost always blended with other fibers, its chemical profile is rarely considered in isolation, but it remains a key part of overall textile composition.
Dyes, Finishes & Chemical Treatments
Beyond the base fibers, swimwear fabrics often undergo multiple finishing processes that can introduce additional chemical variables.
These may include:
- Azo dyes and color fixatives are used to maintain vibrant colors
- UV-protection treatments (UPF finishes)
- Water-repellent coatings, historically associated with PFAS compounds
- Anti-microbial or odor-resistant treatments
Not all swimwear contains all of these treatments, and many brands are now moving toward low-impact dyes or PFAS-free manufacturing, but disclosure varies widely.
This is where third-party certifications—such as OEKO-TEX Standard 100—become relevant, as they test finished fabrics for a range of restricted substances rather than just raw material inputs.
Natural Fibers in Swimwear (Less Common)
A small number of brands use natural fibers such as organic cotton or cotton blends.
These materials:
- Reduce reliance on synthetic polymers
- Typically, avoid certain plastic-based additives
- May use simpler dye processes
However, they also introduce trade-offs:
- Higher water absorption
- Slower drying times
- Reduced elasticity and shape retention
For this reason, most natural fiber swimwear includes at least a small percentage of elastane or is designed for light swimming rather than high-performance use.
Why Material Composition Matters
Material composition directly influences:
- Chemical exposure potential (residues, dyes, finishes)
- Durability and breakdown over time
- Microplastic shedding
- Skin interaction under heat and moisture
Because no swimwear can fully eliminate synthetic components while maintaining performance, the more practical distinction is how fabrics are processed, tested, and disclosed.
This is why the next section focuses on what current research suggests about how these materials interact with the body and environment.
What Research Says About Textile Exposure in Swimwear
Interest in non-toxic swimwear is partly driven by broader research into how chemicals used in textiles interact with the body and environment.
While clothing is not typically considered a primary exposure source compared to food or air, researchers increasingly recognize skin contact with fabrics as a relevant pathway, especially for garments worn tightly against the body for extended periods.
Swimwear creates a unique set of conditions that may influence this interaction.
Dermal Exposure Under Heat and Moisture
One of the primary mechanisms studied is dermal exposure, where substances transfer from fabric to skin.
This process can be influenced by:
- Heat
- Moisture
- Friction
- Duration of contact
Swimwear amplifies all four. When fabric is wet, it remains in closer contact with the skin.
At the same time, body heat and sun exposure can increase skin permeability, which may allow certain compounds—such as dye residues or finishing agents—to migrate more easily.
Although the levels of transfer from textiles are still being studied, regulatory bodies such as the European Chemicals Agency (ECHA) recognize clothing as a potential source of low-level chemical exposure.
Chlorine, Saltwater & UV Interaction
Swimwear is routinely exposed to environmental stressors that most clothing does not encounter:
- Chlorinated pool water
- Saltwater
- Ultraviolet (UV) radiation
These factors can contribute to gradual fiber degradation, particularly in synthetic materials like nylon and elastane.
As fabrics break down, small amounts of additives used during manufacturing—such as stabilizers, dyes, or finishing agents—may be released.
This does not necessarily indicate a direct health risk in typical use, but it is one reason textile safety standards evaluate both chemical content and durability under normal wear conditions.
Microplastic Shedding & Environmental Exposure
A separate but related area of research focuses on microplastic fiber release from synthetic textiles. Polyester and nylon are both plastic-based materials.
During washing and wear, they can shed microscopic fibers that:
- Enter wastewater systems
- Pass through filtration processes
- Accumulate in rivers and oceans
According to research cited by organizations like the International Union for Conservation of Nature (IUCN), synthetic textiles are a significant source of primary microplastics in aquatic environments.
While this is primarily an environmental concern, it has also raised broader questions about long-term exposure through ecosystems and food chains.
What Research Does — and Doesn’t — Show
It is important to keep the current evidence in perspective.
Research does not suggest that wearing conventional swimwear leads to immediate or high-level chemical exposure.
However, it does support several key points:
- Textiles can act as a low-level exposure pathway
- Wet, warm conditions may increase interaction between fabric and skin
- Synthetic materials contribute to environmental microplastic release
Because of this, the conversation around “non-toxic swimwear” is less about eliminating all risk and more about reducing unnecessary chemical inputs where possible.
Why This Matters For Product Selection
This research helps explain why certain material and manufacturing choices are emphasized in safer swimwear:
- Certified Fabrics (e.g., OEKO-TEX) → Tested for restricted substances
- Low-Impact Dyes → Reduce chemical residues
- PFAS-Free Production → Avoids persistent fluorinated compounds
- Natural or Lower-Synthetic Materials → Reduce plastic-based inputs
These factors do not make a swimsuit completely “chemical-free,” but they can influence the overall exposure profile of the garment.
The following brands were selected based on material composition, textile certifications, chemical treatment policies, and overall transparency in manufacturing.
While no swimwear can completely eliminate synthetic inputs, these brands represent a range of approaches—from certified recycled fabrics to natural fiber blends—designed to reduce potential chemical exposure compared with conventional options.
The Best Non-Toxic Swimwear Brands For Babies & Kids
Hanna Andersson’s swimwear is built around a fairly standard synthetic blend, but what differentiates it is the use of OEKO-TEX Standard 100 certified fabrics.
This certification means the finished textile has been tested for a wide range of restricted substances, including certain dyes, heavy metals, and chemical residues commonly used in garment production.
The fabric itself uses a recycled nylon base combined with chlorine-resistant elastane.
From a performance standpoint, this allows the swimsuits to maintain stretch and color stability even with repeated exposure to pool chemicals and sunlight—conditions that typically accelerate material breakdown.
While the material composition remains synthetic, the combination of certification, durability, and consistent manufacturing standards makes this a more controlled option compared to conventional swimwear with unclear sourcing or chemical disclosures.
Price
$50-$79
Materials
OEKO-TEX Certified 80% Recycled Nylon | 20% CREORA Highclo Spandex
location/shipping
United States | Ships Internationally
Little Green Radicals uses recycled synthetic fabrics that are also OEKO-TEX certified, which helps address two separate concerns: material sourcing and chemical safety testing.
While recycled nylon does not eliminate synthetic exposure, certification adds a layer of verification around restricted substances in the final fabric.
The swimwear is designed with stretch and comfort in mind, using a typical nylon-spandex blend but produced under stricter textile standards.
Flat seams and simplified construction reduce friction points, which can be relevant for children with sensitive skin during extended wear.
This brand represents a more transparent version of conventional swimwear.
It does not fundamentally change the material category, but it improves visibility into how the fabric is processed and tested.
Price
$32-$68
Materials
OEKO-TEX Certified | 82% recycled Nylon | 18% Spandex | UPF 50+ Sun Protection
location/shipping
United Kingdom | Ships To The United States & Internationally
Reima brings a different level of technical performance and certification standards, using Bluesign-approved materials that are evaluated across the entire production process, including chemical inputs, water use, and worker safety.
This goes beyond finished fabric testing by addressing how textiles are manufactured at each stage.
For swimwear, this can provide a more comprehensive approach to reducing harmful chemical exposure compared to single-point certifications.
The fabrics are still synthetic—typically recycled polyester or polyamide blends—but are engineered for durability under heavy use, including chlorine exposure and outdoor conditions.
Price
$35-$60
Materials
Recycled Polyester/Polyamide Blends | Bluesign-Approved
location/shipping
United States | Ships To Canada
Seaesta Surf takes a less common approach by incorporating organic cotton into swimwear, reducing the total proportion of fully synthetic fibers.
This shifts the material profile closer to natural textiles while still maintaining enough structure for use in water.
The inclusion of recycled polyester helps retain durability, but the higher cotton content changes how the fabric behaves.
These suits tend to feel softer and more breathable, though they may not perform as well under heavy chlorine exposure compared to fully synthetic options.
The brand also avoids unnecessary trims and uses OEKO-TEX certified low-impact dyes, which can reduce additional chemical inputs during production.
This makes it a useful middle-ground option between performance swimwear and natural fiber alternatives.
Price
$54-$68
Materials
52% Organic Cotton Fabric | 48% Recycled Polyester | OEKO-TEX Certified Low-Impact Dyes
location/shipping
United States | Ships Internationally
Pure Earth Collection takes a less conventional approach by using predominantly organic cotton (98%) in swimwear, with only a small amount of Lycra added for stretch.
This significantly reduces reliance on fully synthetic fabrics compared to standard swimsuits.
The brand also emphasizes chemical safety in areas that are often overlooked, including the use of non-toxic dyes and Lycra that is explicitly free from PFAS and BPA.
While most swimwear brands do not disclose this level of detail, these material choices suggest a more controlled manufacturing process.
Because cotton absorbs more water than synthetic fibers, these suits behave differently in use.
They are generally softer and more breathable, but may be less suited for frequent exposure to heavily chlorinated pools.
Price
£46-£60
Materials
98% Certified Organic Cotton | 2% Lycra (BPA-Free) | Non-Toxic Dyes
location/shipping
United Kingdom | Ships To The United States & International Countries
Esembly approaches swimwear from a different angle, focusing specifically on infant swim diapers rather than full garments.
The design prioritizes containment and safety while reducing exposure to common plastic additives.
The materials include recycled polyester with a waterproof TPU layer, but the brand explicitly avoids substances such as BPA, PVC, phthalates, and lead.
This level of disclosure is less common in this category and provides clearer insight into what is not included in the product.
Because swim diapers require waterproofing, synthetic materials are still necessary.
However, the targeted removal of higher-concern chemicals makes this a more controlled option for infants.
Price
$18.50
Materials
OEKO-TEX Certified | GRS-Certified Recycled Polyester With Waterproof TPU | Free of Harmful Chemicals
location/shipping
United States | Ships Internationally
Where Many “Non-Toxic Kids Swimwear” Brands Fall Short
As interest in non-toxic clothing grows, more children’s swimwear brands now use terms like eco-friendly, safe, or non-toxic in their marketing.
However, these claims are often loosely defined and can refer to very different aspects of production.
Understanding where these claims fall short is important because many products marketed as safer alternatives still rely on similar materials and manufacturing processes as conventional swimwear.
Recycled Fabrics Are Still Synthetic Polymers
One of the most common claims in kids’ swimwear is the use of recycled materials, such as nylon or polyester made from plastic bottles or ocean waste.
While recycling can reduce environmental impact, the resulting fibers are still plastic-based polymers. From a chemical perspective, they behave similarly to conventional synthetic fabrics.
This means they may still:
- Contain processing additives
- Shed microplastic fibers
- Rely on similar dye and finishing systems
Recycled materials can be an improvement in terms of waste reduction, but they do not inherently eliminate chemical exposure concerns.
“Non-Toxic” & “Eco” Are Not Standardized Terms
Unlike certifications, terms like non-toxic, green, or eco-conscious are not regulated in the apparel industry.
Brands may use these labels to describe:
- Recycled inputs
- Lower-impact production
- General sustainability goals
However, without third-party testing or detailed material disclosure, it is difficult to determine what these claims actually mean in practice.
This is why certifications such as OEKO-TEX Standard 100 or Bluesign tend to carry more weight—they provide measurable criteria rather than broad marketing language.
Performance Features May Involve Chemical Treatments
Swimwear is often designed with features such as:
- UV protection (UPF ratings)
- Water resistance
- Chlorine resistance
These properties can be achieved through fiber structure alone, but in some cases, they may also involve chemical finishing treatments applied during manufacturing.
Historically, certain water-repellent treatments have involved PFAS compounds, although many apparel companies are now transitioning away from intentionally added PFAS.
Because disclosure is inconsistent, it is not always clear whether performance claims are achieved through fiber design or chemical coatings.
Certification Does Not Mean Completely Chemical-Free
Even when swimwear is certified, it is important to understand what that certification represents.
For example, OEKO-TEX Standard 100 tests finished textiles for a list of restricted substances above specific thresholds.
This helps identify fabrics with lower levels of harmful chemicals, but it does not mean the material is completely free from all chemical inputs.
Similarly, certifications like GRS or Bluesign focus on broader aspects such as recycled content or responsible manufacturing processes.
These standards improve transparency and reduce risk, but they do not eliminate the presence of synthetic materials or all potential chemical exposure.
Limited Material Transparency Remains Common
A significant number of swimwear brands still provide minimal information about:
- Exact fiber composition
- Dye processes
- Chemical treatment policies
- Certification status
Without this information, it becomes difficult to assess how a product compares to alternatives.
Brands that clearly disclose materials, certifications, and manufacturing practices offer a more reliable basis for evaluating safety.
What Type of Kids’ Swimwear Do You Actually Need
The right type of non-toxic swimwear depends on how it will be used. Different materials prioritize different outcomes, and no single option performs best across all conditions.
If Reducing Synthetic Exposure Is Your Priority
Natural fiber options, such as organic cotton or high-cotton blends, reduce reliance on petroleum-based materials and may limit certain chemical additives.
These are typically better for light swimming or beach use, as they absorb more water and have less stretch than synthetic fabrics.
If Durability and Performance Matter Most
For frequent swimming or pool use, synthetic blends remain the most practical choice due to their stretch, chlorine resistance, and faster drying. In this case, look for OEKO-TEX or Bluesign-certified fabrics to reduce uncertainty around chemical residues.
If Your Child Has Sensitive Skin
Certified fabrics, low-impact dyes, and simpler construction can help minimize irritation. Fit and fabric softness also play a role, especially when swimwear is worn wet for extended periods.
If Environmental Impact Is the Main Concern
Recycled synthetics reduce waste but remain plastic-based, while natural fibers reduce plastic use but may wear out faster. Each option involves a different trade-off.
A Practical Way to Approach It
Instead of looking for a completely “non-toxic” swimsuit, focus on priorities:
- Fewer synthetics → natural fiber options
- Better durability → certified synthetics
- More transparency → brands with clear material disclosures
Signs Your Child’s Swimwear May Be Causing Irritation or Exposure Issues
Because swimwear is worn tightly against the skin—often while wet and exposed to heat—certain material or chemical factors can become more noticeable over time.
While it’s not always possible to identify a specific cause, there are a few common signs that may point to fabric-related irritation.
Skin Irritation After Swimming
Redness, itching, or mild rashes that appear after wearing a swimsuit may be linked to fabric friction, dye residues, or sensitivity to synthetic materials. Wet fabric can increase skin contact and make these reactions more noticeable.
Persistent Chemical or Plastic Odor
A strong smell when the swimsuit is new may indicate the presence of dyes, finishing agents, or manufacturing residues. These odors often fade after washing, but a persistent scent can suggest heavier chemical processing.
Discomfort When Wet
If a swimsuit feels noticeably uncomfortable only when wet, this may be related to how the fabric interacts with the skin under moisture and heat. Some materials become rougher or cling more tightly when saturated.
Rapid Fabric Breakdown
Swimwear that loses elasticity, fades quickly, or feels rough after limited use may be degrading under chlorine, saltwater, or UV exposure. As fibers break down, the structure of the fabric—and any embedded treatments—can change.
Increased Sensitivity Over Time
If irritation develops gradually rather than immediately, repeated exposure to the same fabric or treatment may be a contributing factor, especially for children with sensitive skin.
Expert FAQs About Non-Toxic Kids Swimwear
Most swimwear cannot be completely free of synthetic materials due to the need for stretch, durability, and water resistance.
In practice, “non-toxic” swimwear refers to products made with safer textile standards, reduced chemical treatments, and certified fabrics rather than fully chemical-free materials.
Some swimwear has historically used PFAS-based treatments for water or stain resistance. Many brands are now phasing out intentionally added PFAS, but disclosure is inconsistent.
Unless a brand specifically states PFAS-free production, it may be difficult to confirm.
Polyester is widely used in children’s clothing and is generally considered stable for normal use.
However, it is a synthetic plastic-based fiber, and concerns typically relate to how the material is processed, dyed, and whether it contributes to microplastic shedding over time.
Nylon is also commonly used in swimwear and performs similarly to polyester in terms of safety for typical use.
As with other synthetic fibers, the main considerations involve dye treatments, chemical finishes, and overall manufacturing standards rather than the base fiber alone.
Swimwear made from organic cotton or natural fiber blends reduces reliance on synthetic materials and may limit certain chemical additives.
However, these fabrics absorb more water, dry more slowly, and generally provide less stretch, which can affect performance.
Recycled swimwear can reduce environmental impact by repurposing plastic waste, but the materials remain synthetic polymers.
Safety differences depend more on certifications and manufacturing practices than on whether the material is recycled.
Common textile certifications include OEKO-TEX Standard 100, Bluesign, Global Recycled Standard (GRS), and GOTS for natural fibers.
These certifications help verify that fabrics have been tested for restricted substances or produced under more controlled conditions.
In some cases, yes. Irritation may be related to fabric friction, dye residues, or sensitivity to synthetic materials. Wet swimwear can increase skin contact and make these reactions more noticeable.
UPF protection can be achieved through fabric density, fiber type, or added treatments. Many brands achieve UV protection through tightly woven fabrics rather than chemical coatings, but this is not always clearly disclosed.
Washing new swimwear before use can help remove residual dyes, finishing agents, or manufacturing residues that may remain in the fabric after production.
What Certifications Should You Look For In Kids’ Swimwear?
Common textile certifications include:
- OEKO-TEX Standard 100 — Tests finished fabrics for restricted substances
- Bluesign — Evaluates chemical use across the production process
- GRS (Global Recycled Standard) — Verifies recycled content and some chemical criteria
- GOTS (for natural fibers) — Applies to organic textiles and processing standards
These certifications do not eliminate synthetic materials but can help verify lower levels of harmful substances and more controlled production practices.
Still Comparing? Here’s a Quick Breakdown
- For certified recycled materials with strong transparency → Little Green Radicals
A more verified version of conventional synthetic swimwear. - For the most balanced, everyday option → Hanna Andersson
Certified materials, strong durability, and widely accessible across sizes. - For higher performance with stricter production standards → Reima
Best suited for frequent swimming, lessons, and heavy use. - For the lowest synthetic content → Pure Earth Collection
Primarily organic cotton with minimal stretch fibers. - For a middle-ground between natural and performance → Seaesta Surf
Blended fabrics that reduce synthetic content while maintaining usability.
Final Assessment: Are Non-Toxic Kids’ Swimsuits Worth It?
Completely chemical-free swimwear is difficult to achieve. Most swimsuits rely on synthetic fibers to provide the stretch, durability, and resistance required for repeated exposure to water, chlorine, and sunlight.
However, material choices and manufacturing standards vary significantly across brands.
Some swimwear is produced with limited transparency around dyes, finishes, and chemical treatments, while others use certified fabrics and more controlled production processes.
In practice, choosing non-toxic swimwear is less about eliminating all synthetic materials and more about reducing unnecessary chemical exposure where possible.
Certifications such as OEKO-TEX Standard 100 or Bluesign, along with clear material disclosure, can provide a more reliable basis for comparison.
Natural fiber options can further reduce reliance on synthetic polymers, although they may involve trade-offs in performance and durability.
Certified synthetic fabrics, while still plastic-based, can offer a more practical balance between usability and reduced chemical risk.
For most families, the most effective approach is selecting swimwear that aligns with how it will be used—prioritizing certified materials, transparent sourcing, and appropriate performance for the setting rather than attempting to find a completely “non-toxic” solution.
Sources & Scientific References
- U.S. Environmental Protection Agency (EPA) — PFAS Overview
https://www.epa.gov/pfas - European Chemicals Agency (ECHA) — Chemicals in Textiles
https://echa.europa.eu - World Health Organization (WHO) — Environmental Exposure to Chemicals
https://www.who.int - OEKO-TEX® — Standard 100 Certification Overview
https://www.oeko-tex.com - National Institutes of Health (NIH) — Endocrine Disrupting Chemicals Research
https://www.nih.gov - International Union for Conservation of Nature (IUCN) — Primary Microplastics in the Oceans
https://www.iucn.org - Textile Exchange — Preferred Fiber & Materials Market Report
https://textileexchange.org
