What is the plastic sheeting/ribbons called that insulates big cold boxes from outside environment?

when you go into a huge refrigerator thats door remains open and has plastic ribbons for insulationWhat is the plastic sheeting/ribbons called that insulates big cold boxes from outside environment?
Standard is PU Foam, but elite cool boxes use Patented Ultratherm. Both are CFC freeWhat is the plastic sheeting/ribbons called that insulates big cold boxes from outside environment?
I can't recall it's name but go to your local hardware store and ask .


It's also used as fly screens in varying thicknesses.


It's PVC apparently.


Commonly used in Cafes thus called CAFE BLINDS.