I’ve never seen this flooring insulation

[lkage (Larry Kage, CMI)]

I see what looks like a JM (Johns Manville) on the bottom of one. It may be something like this:

ComfortTherm Poly Faced Fiberglass Insulation Roll

ComfortTherm R-13 ComfortTherm Poly Faced Fiberglass Insulation Roll 15 in. x...