FabricIQ
Reading the label…
FabricIQ
Reading the label…
Health · March 2026 · 6 min read
Polyester is in 60% of all clothing sold worldwide. It's cheap, durable, and wrinkle-resistant. But a growing body of research suggests it may not be harmless.
Polyester itself won't hurt you in the short term. But it has three long-term concerns that are worth knowing about: microplastic shedding, chemical leaching, and skin absorption.
Every time you wash a polyester garment, it releases up to 700,000 microplastic fibers into the water supply. These fibers are smaller than 5mm — too small for water treatment plants to catch.
Where they end up:
A single polyester fleece jacket releases 1.7g of microfibers per wash — that's about 250,000 individual plastic particles.
Polyester is made from PET plastic. The production process uses chemicals that can remain in the fabric:
You wear clothes 16+ hours a day. Your skin absorbs what touches it, especially:
A 1993 study in European Urology found men who wore polyester underwear had significantly lower sperm counts compared to cotton. The effect reversed when they switched back to cotton.
This is an emerging area. The evidence is growing but not conclusive:
Important: correlation ≠ causation. More research is needed. But the precautionary principle suggests minimizing unnecessary exposure.
Switch underwear and base layers to cotton or bamboo
These are the garments with the most skin contact. The switch is easy and affordable.
Wash synthetics cold, less often, in a Guppyfriend bag
Cold water reduces microfiber shedding by ~30%. The bag catches 86% of what does shed.
Skip the dryer for synthetic clothes
Heat breaks down polyester fibers faster, creating more microplastics. Air dry instead.
Check your clothes before buying
Read the label. Use FabricIQ to instantly see if a garment is synthetic, natural, or a blend.
Look at the tag on your shirt. Type the composition below. See the truth.