ust = universal system tubeless. No inner tubes
Yeah, you have a thicker tyre to prevent punctures, because there is not inner tube you can't get pinch flats you also have a lower rolling resistance due to there being no inner tube, the other main advantage is you can run stupidly low PSI as there is no risk of pinch flats, meaning better grip.
I've also got stans no tubes in mine which is like a latex glue so if something does get through the tyre then it seals the tyre.
Trouble is you need to try the saddles out to see if they're alright
This!
Saddles come in so many different shapes and sizes you really need to test them out for your body shape and flexibility, personally I'd recommend Fizik as I run those on my MTB and road bike.