That means you are placing harmful and possibly toxic chemicals next to you or your family’s skin. The one problem with nylon’s wrinkle-resistant nature is that it may be chemically treated to resist those wrinkles. That additional fabric should help keep wrinkles way and cut down on your laundry time. If you are looking for wrinkle-resistant clothing then you should look at those fabrics blending with nylon.
The reason behind that conclusion is that complex weaves tend to keep wrinkles out and nylon comes from a complex weave style. It may be more wrinkle-resistant than wrinkle-free.