Northwind is correct IMHO.
They are soft but quite tough for their weigh.
I’m clumbsy, 14st and not that slow downhill.
I’ve got crests tubeless on my 100mm XC hardtail and occasionally forget that I’m riding the lightweight bike. It gets hammered down bouldery stuff like Garburn & ICR and is quite happy dropping multiple 3ft flights of steps top to bottom.
No I can’t claim that they’ve stayed true but they’ve not failed either and have always been easy enough to re-true now and then.
When I eventually kill them, I’ll go up to Arch EX.
If the hardest thing they’ll have to contend with is trail centres though, Crests will be fine.