Is Polyester Safe for Kids? Polyester vs Cotton, Explained by a Kidswear Maker

Quick answer: polyester is not poisonous, and a polyester raincoat or swimsuit is fine. But for clothes a child wears all day against the skin in Indian weather, pure cotton is usually the better choice. Polyester absorbs very little sweat, so it can feel hot and clammy, and eczema charities list synthetics among fabrics that can trigger itching. That is why every piece we make, from our pure cotton T-shirts for kids to our winter sets, is 100% cotton.

Below, a kidswear manufacturer from Tiruppur explains what polyester actually is, how it compares with cotton, when it is perfectly fine, how to read a label, and why we chose not to use it.

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Contents

• What is polyester? (meaning in Hindi and Tamil)
• Is polyester safe for kids?
• Polyester vs cotton: side-by-side table
• Is polyester good for summer in India?
• Polyester, sensitive skin and eczema
• What about poly-cotton blends?
• When polyester is perfectly fine
• How to check a label in 30 seconds
• Why Gozi does not use polyester
• FAQ

What is polyester?

Polyester is a synthetic fibre made from petroleum-based chemicals. The most common type, PET, is the same family of plastic used in many bottles. It is melted and pushed out as long, smooth filaments, which are spun into yarn and woven or knitted into fabric.

Polyester meaning in Hindi: पॉलिएस्टर एक सिंथेटिक (कृत्रिम) कपड़ा है, जो पेट्रोलियम से बने प्लास्टिक जैसे रेशों से बनता है। यह मज़बूत होता है और जल्दी सूखता है, लेकिन पसीना बहुत कम सोखता है।

Polyester meaning in Tamil: பாலியஸ்டர் என்பது பெட்ரோலியத்திலிருந்து தயாரிக்கப்படும் செயற்கை இழை (synthetic fibre). இது உறுதியானது, விரைவில் உலரும், ஆனால் வியர்வையை மிகக் குறைவாகவே உறிஞ்சும்.

Cotton, by contrast, is a natural plant fibre. Its fibres are hollow and absorbent, which is why a cotton T-shirt soaks up sweat while a polyester one tends to leave it on the skin.

Why is polyester kidswear so cheap?

Polyester is made in factories from petrochemicals, at enormous scale, and does not depend on a harvest. It also hides cheap construction well: it holds a bright print, resists wrinkles and looks new on the shelf. Cotton costs more to grow, spin and finish properly. So a low price usually reflects the fibre, not better value.

Is polyester safe for kids?

Here is the honest answer. Polyester is not toxic in itself, and polyester clothing that carries a recognised safety certification has been tested for harmful substances. The concerns for young children are mostly about comfort and skin, not poison:

• It holds very little moisture. In the commercial moisture regain values used by the textile trade (ASTM D1909), polyester is listed at about 0.4%, while cotton yarns are listed at about 7 to 8.5%. In plain words, cotton takes up sweat; polyester mostly does not.
• Children overheat more easily. India's National Centre for Disease Control lists infants and young children among the groups most at risk in hot weather, and advises thin, loose, cotton garments, preferably light coloured.
• It can aggravate sensitive skin. The UK's National Eczema Society notes that wool and synthetic materials such as polyester and nylon can cause overheating, sweating and irritation, and that cotton is the most commonly recommended material.
• Finishes and dyes vary. Any fabric, cotton included, can carry problem dyes or finishes. A label such as OEKO-TEX STANDARD 100 means every part of the item was tested against a list of over 1,000 harmful substances, with the strictest limits for babies and toddlers up to 36 months (Product Class 1).

So "is polyester bad for kids?" depends on the item. For a jacket worn over cotton, it hardly matters. For a night suit worn for ten hours, a school T-shirt in April, or a toddler with eczema, cotton is the kinder choice.

Polyester vs cotton for kids: side-by-side

Not all cotton is equal, either. Yarn quality and fabric weight decide how soft and long-lasting it is. See our guides to combed cotton and GSM in fabric.

Is polyester good for summer in India?

For everyday kids' clothes, no. In 38 to 45°C heat, or in humid coastal cities like Chennai, Mumbai and Kolkata, a child's body cools itself by sweating. Cotton takes up that sweat and lets air through; polyester leaves more of it sitting on the skin, which is uncomfortable and can contribute to prickly heat.

What about "dri-fit" sports tees? Those are polyester knits engineered to spread sweat so it evaporates, and they work for a short football session. For a full school day, a nap or a long function, a loose, light cotton T-shirt is the safer bet. For more summer tips, read how to dress your toddler for 40°C summers.

And winter? Polyester fleece is warm, but it does not breathe well, so children who run around indoors often end up sweaty under it. Cotton layers, such as a cotton T-shirt under a cotton French terry sweatshirt, let you add or remove warmth. Our guide to choosing sweatshirts for kids explains how.

Polyester, sensitive skin and eczema

If your child has eczema or very sensitive skin, clothing that touches the skin matters. The National Eczema Society describes cotton as "soft, cool, great at absorbing sweat, easily washable" and warns that "cotton rich" blends can contain a significant proportion of polyester, so read the label. It also points to rough seams, scratchy labels and fastenings as common irritants. For a fuller fabric-by-fabric guide, read best fabrics for sensitive and eczema-prone kids.

When to see a doctor

Changing fabric can help comfort, but it does not treat a skin condition. See your paediatrician or a dermatologist if a rash keeps coming back, spreads, oozes, looks infected, disturbs your child's sleep, or comes with fever. This article is general information, not medical advice.

What about poly-cotton blends?

A poly-cotton (for example 60% cotton, 40% polyester) sits in between. It wrinkles less and dries faster than pure cotton, and it feels more breathable than pure polyester. The more polyester it contains, the less sweat it absorbs. For school uniforms worn over a cotton vest, a blend can be practical. For innerwear, sleepwear, summer play clothes and babies, choose 100% cotton.

When polyester is perfectly fine

• Raincoats and windcheaters: water resistance is the point.
• Swimwear: it dries fast and holds its shape in chlorinated water.
• Outer jackets and puffers: worn over cotton, not against the skin.
• Short sports sessions: a performance tee for an hour of football is fine.
• Fancy dress for an hour or two: just put a cotton layer underneath if you can.

The rule of thumb: the closer to the skin and the longer it is worn, the more cotton matters.

How to check a label in 30 seconds

1. Find the composition label (usually on the side seam). Look for "100% cotton". Words like "cotton feel", "cotton touch" or "cotton rich" can still mean a lot of polyester.
2. Check for a safety certificate such as OEKO-TEX STANDARD 100, especially for babies under 3.
3. Do the feel test: very shiny, slippery or "squeaky" fabric is often synthetic.
4. Look inside: soft, flat seams and no scratchy tags matter as much as the fibre.
5. Check the care label: cotton that is pre-washed or biowashed shrinks and creases less.

Why Gozi does not use polyester

We are parents, and we make our clothes in our own unit in Tiruppur, the knitwear hub of Tamil Nadu. Using polyester would make manufacturing cheaper for us. We chose 100% cotton because the fabric touching a child's skin all day deserves that extra care. Here is what that looks like across our range:

• T-shirts: our Red Label tees, such as the Butter Yellow Tee and The Essential Classic White Tee, are made from 100% combed, biowashed Red Label cotton with a relaxed fit. Prefer value? Try a pack of 3 Red Label cotton T-shirts.
• Joggers: instead of polyester track pants, our grey kids joggers are 100% cotton French terry at 240 GSM, with a covered elastic waist. See all cotton joggers and track pants for kids, and learn about the fabric in what is French terry fabric.
• Winter sets: the Jungle Friends sweatshirt set is 100% biowashed cotton with no fleece lining, printed and dyed at GOTS-certified units. Browse all sweatshirt sets for kids.
• Sleepwear: browse our cotton night suits for kids; full-sleeve sets like the Hippo Cuddle are made from soft interlock cotton for AC rooms.

A note on microplastics

Polyester is a plastic fibre, and synthetic clothes shed tiny fibres in the wash. A 2017 study by the International Union for Conservation of Nature found that almost two-thirds of primary microplastics in the oceans come from washing synthetic textiles and the abrasion of tyres. Choosing cotton for everyday clothes is one small way to shed less plastic.

Frequently asked questions

Is polyester bad for babies?

Polyester is not poisonous, but babies overheat easily and have delicate skin. For bodysuits, sleepwear and everyday wear, choose soft 100% cotton, ideally with an OEKO-TEX STANDARD 100 label.

Is polyester good for kids?

It is good for raincoats, swimwear and outer jackets. For clothes worn all day against the skin, especially in Indian heat, cotton is more comfortable.

Cotton or polyester: which is better for kids?

Cotton, for most everyday clothing. It absorbs sweat, feels cooler and is the fabric eczema charities recommend most often. Polyester wins only on drying speed, wrinkle resistance and price.

Is 60% cotton 40% polyester good for summer?

It is better than pure polyester but warmer and less absorbent than 100% cotton. For summer play clothes and sleepwear, pure cotton is the cooler choice.

Is polyester safe to wear every day?

For most people, yes, especially with a safety certification. Children who sweat a lot or have sensitive skin are usually more comfortable in cotton.

Does Gozi use any polyester?

No. Our clothing is made from 100% cotton.

Related reading

• What is combed cotton, and why it matters
• Best fabrics for sensitive and eczema-prone kids
• How to choose sweatshirts for kids
• About Gozi, a kidswear maker in Tiruppur