Apparently tyvek comes in a multitude of types Just have to find the right one for your needs
Yep. Think of "Tyvek" as a word like "Nylon". You wouldn't walk into a shop and just ask for Nylon. Tyvek has been around a long time. The first time I saw it was when I took apart a 5-1/2" floppy disk - the sleeve is lined with Tyvek. This was quite different from the Tyvek that showed up in FedEx envelopes, which is different from the Tyvek used to wrap houses.