That's pretty much all that tires are. There may be various added options like
Schwalbe's blue layer under the tread, a kevlar strip under the tread, etc.,
but the essence of bike tires is naught but fabric and rubber a la John Dunlop.
For that matter, this is the case for airplane, car, truck
All that the "casing" is on gumwall, non-puncture protected Panaracer tires
is just a web of strands, embedded in rubber? Topped off with a black tread?
I have seen coronal views of tires with a puncture proof casing that looks
solid, that wraps around both beads like a blanket, with the tread
