The Big Betty on the front of my FS is UST (with the logo an’ evryfink). Weighs a lot more than the tubeless ready ones, so I assume that includes sidewall reinforcement. Hans Dampfs now come in “Super Gravity” compound too, having more sidewall reinforcement than the snakeskin ones IIRC.
Jimjam’s right though; although the sipes on the tread are still visible, the side knobs are all coming away from the carcass on Big Betty & Hans Dampfs (snakeskin, not super gravity) this year, and Fat Alberts last year, after 2 weeks in the Alps. No issues with sidewall damage on either.