Why is polyester often added to cotton cloth, even if only in tiny few percentage quantities?

Question

I often see on clothes, bags, sheets, etc. a few % of polyester in the cotton cloth label. What does this mean and why do they do it? Are they weaving one out of every few strands out of polyester? Or is the fiber itself made of a few % polyester in composition? And what does it do for the cloth?

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Answer 1

I think the main reason polyester is added to cotton is to help prevent wrinkles. Good quality 100% woven cotton doesn’t pill, but it does wrinkle. I prefer to wear 100% even if it does wrinkle.