No guarantee
I had a spill on a strtech of sheet ice last spring, in fact three of us came off. We all had Sinisalo enduro/moto-x type clothing and integral padding.
Now probably due to the poor weather conditions and the type of small country lane, speed was low resulting in us skidding along on our cordura material.
No cuts, breaks or grazes but maybe a bruise or two, no big deal.
It could of been better or worse.
Riding trails with leather on is totally out of the question IMHO.
I have no fears of wearing this kit on my trailbike.
On the GSA I wear a HG Touareg Suit.
Timpo.