The most intimate object you own is the shirt you slept in last night. We don't think about it that way. We should.
Roughly two-thirds of the clothing produced globally is now made of synthetic fibres — polyester, nylon, acrylic, polyamide, and a long list of derivatives that all begin life as crude oil. Cheap, durable, wrinkle-free, and on the shelf for under $10. The bargain has a cost, and most of it is paid by your skin.
What "synthetic" actually means
Synthetic fibres are plastics. Polyester is polyethylene terephthalate — the same family as the bottle your water comes in. Nylon is a polyamide cousin of fishing line. Acrylic is polyacrylonitrile, a chemical relative of plexiglass. These fibres are extruded as molten polymer, drawn into thread, and woven into the t-shirt now sitting two inches from your body.
1. Synthetics don't breathe
Cotton and linen — natural fibres in general — are hollow at a microscopic level. Air moves through them. Sweat evaporates. The fabric stays cool because the cloth and the climate underneath it are in conversation. Synthetics are dense at the molecular level. They trap heat and moisture against the skin, which is why a polyester shirt feels clammy in summer heat and a linen one doesn't. Trapped moisture can lead to common skin irritations — especially in the underarms, the back, and the inner thighs.
2. Synthetics shed microplastics — onto your skin
Every wear and every wash releases microscopic fibres. A 2019 study in Environmental Science & Technology measured up to 700,000 microfibres released from a single load of synthetic laundry. A meaningful fraction of these don't make it down the drain — they cling to the inside of the garment and sit against the skin. Microplastic particles have been detected in human blood, lung tissue, and breast milk. The clothes themselves are a vector.
3. Synthetics carry their dye chemistry with them
Disperse dyes — the only class of dye that bonds to polyester — are documented contact allergens. International textile-safety standards consistently flag them as skin sensitisers. Reactions look like persistent rashes along the seams of bras, shirt collars, the backs of leggings. The term is textile dermatitis.
4. The chemistry doesn't end at dye
Synthetic garments are often treated with formaldehyde resins (for wrinkle resistance), perfluorinated finishes (for water repellency), antimicrobial silver nitrate (for odour), and brominated flame retardants. Most of these are not on the label. Many of these can leach onto skin in the presence of warmth and moisture — i.e., when you're wearing the garment.
5. The receipt for cheap clothing is paid by the body
Skin rashes. Persistent itch. Heat-related irritation. These aren't caused by clothing alone, but for sensitive skin, the wrong fabric is often the difference between flare and calm. Studies have shown that breathable natural fibres like cotton, linen, silk, and bamboo viscose tend to be gentler on chronically irritated skin compared to polyester and nylon.
What to wear instead
The simplest rule we follow at Zykaz: if it didn't grow, we don't wear it. Cotton. Linen. Hemp. Tencel (regenerated from wood pulp, not petroleum). Silk. These fibres breathe, regulate temperature, biodegrade at end of life, and — most importantly — don't pick a fight with your skin.
Read the label before you read the price tag. The most luxurious thing a garment can do is leave you alone all day.
Note: this article is general information about textile chemistry and is not medical advice. If you have a persistent skin condition, please consult a healthcare professional.
Shop natural-fibre only → Every Zykaz piece is natural fibre. See the edit.