I have not needed to take them apart to be truthful. The outer jacket is quite flexible and the inner conductors are supposedly 20 ga. which makes a great combination for ruggedness and reliability. Honestly, I have been using these cables for several years with only two of them ever having a problem. Those had an internal break about a third of the length (30 ft.) which is more than likely due to a truck running over them (or a fully loaded equipment cart). Just outta curiosity, I just now took one end apart. The shield IS stranded which points to a woven shield rather than a foil one. It doesn't appear to be more than one layer. I don't remember ever coming across double layer shielding in the past 50 years including working in Aerospace. If there are, they would be quite a bit stiffer than these cables.
I have a pair of these as backup to the monoprice branded cables. I was a bit perplexed as to why there is a Stage Right and Monoprice brand. Thought they were one and the same. Anywho, to the question at hand. Cables seem solidly built and have used running alongside power cables, dmx cables, drivelines, mic cables etc and knock on wood have been flawless. IMHO they are well shielded. Haven't opened to confirm what they use.
I’m not an engineer so I couldn’t help with the degree nor have I torn one apart to check the internal build quality. I do know the work well for our production company and haven’t had any issues as of this point.
I have not had this long enough to comment on durability, but initial observations are good. This cable feels thicker and well made compared to others in my collection. Connectors are solid and the whole thing is quiet and does it's job. It's invisible, which is good.