Men's Clothing
Plural Nouns

Why do steam irons have a permanent press setting?


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Because "permanent press" isn't really permanently pressed. It's more resistant to wrinkling, but it still can. The fibers have been stiffened so that they are less likely to take a set. You want an iron that can re-flatten the material without destroying the wrinkle-resistant properties, That is an only moderately hot iron, as opposed to, for example, the extreme heat needed to smooth out a pair of denim jeans.