Unfortunately, you are using an out of date browser which is not fully compatible. It may not display this or other websites correctly. You should upgrade or use an alternative browser.
One thing to remember is that Mylar D® is being made under a different name since about 2001. It is now Milinex® and made in Europe rather than the US. So be sure that you ask for the product under the new name.
Jim Miller can correct me if I have the date incorrect and the spelling.