:laughing: My apologies for the delay in replying. I was searching for (but failed to find) a physical press kit that contained the answers you sought.
Let me backtrack a bit and explain myself. As a member of SAMA (Southern Automotive Media Association), I get to participate as a journalist juror in their annual
Topless in Miami competition to name the best convertible (whether soft top or retractable hardtop) in a number of categories. Given the diminishing numbers of convertibles offered by carmakers and at the request of some of the ones that don't even offer convertibles (primarily Hyundai/Kia, as I recall), the parameters were expanded to include panoramic glass sunroofs in separate categories.
Anyway, in 2015 (the second year I participated as a juror),
Haartz (the world's largest supplier of automotive convertible soft top fabrics) became the title sponsor of Topless in Miami and, to mark this, gave us a detailed press kit outlining their different grades of soft tops, how many layers they were made of, the composition of said layers, what convertibles came from the factory with what grade of tops, etc.
Failing to find the physical press kit, I went to their website. Fortunately, the info is on their site, and suitably updated from 2015, to boot! Anyway, here's the link:
https://www.haartz.com/exteriors
To find the information you seek, scroll on the EXTERIORS link across the top of the screen (it's the third from left) and the drop-down menu will list 6 different CONVERTIBLE TOPPING "families" (SONNENLAND, TWILLFAST, STAYFAST, LANDMARK, BLUESKY and PVC TOPPING). Click on each of those listings on the actual Haartz site, and all the information on composition, number of layers and vehicle applications will be there.
Finally, I'll add that the 9th annual Topless in Miami is coming up in exactly 3 weeks, and, again, I'll be there as a juror.