Nylon and polyethylene are not the same so far as I can remember from chemistry class. This item is described as being made of woven nylon, but when the package arrived it clearly says polyethylene. When used as a sun shade, nylon makes a pleasant, rustling sound like sails in the wind. Polyethylene makes a harsh, annoying, crackling sound. All I can say is I won't be ordering anything described as lingerie made of nylon for my wife from Amazon for fear of receiving a box of ziplock bags.