I've been wanting to replace my panda film with something better since I bought it, and I'm looking at foylar and orca. I cant seem to find foylar locally but at least one of my local shops carry orca and when I seen it in person I instantly recognised it as tyvek house wrap. The only difference that I noticed was the thickness and the absence of the word tyvek in huge print on one side. So maybe someone who is more in the know could tell me if there is a significant difference?