What makes the material in a child's toy crinkly?

What makes the material in a child's toy crinkly, so it makes a sound and crinkles when you touch it? I am doing a project, hope you can help.|||According to Tiny Love Toy company it is a type of cellophane. I have used 4 kinds and found all to have major faults. First at the seam it tears easily and within a few washings seems to clump up inside the object. I tried true cellulose cellophane, polyprolene film or the most commonly purchased cello, shrinkable basket



http://forums.ebay.com/db2/thread.jspa?t鈥?/a>



00000000000000000000000000





have also seen it described as MYLAR



a tyoe of plastic film



000000000000000000000000000000000000



Have also seen that some DIY craft toys use the packing from breakfast cereal boxes.





so I guess it is something similar

ski doo