As per hodgynd and rocketdog I don’t believe they exist either.
I’m on a longterm quest to find something that works in the peaks for more than one winter (or in some instances more than 2 rides):
So far I’ve been through:
3x altura attacks all delaminated and warrantied
1x Endura MT500 waterproof delaminated warrantied
2x Tenn waterproof (the worst of all) both wore through warrantied
2x Maddison storm first ripped second delaminated and all the seals on the zips came off warrantied
2x Maddison addict dwr, very nice shorts but the taped seam around the bum comes off in a couple of rides warrantied
Currently on Atura 360 with the dwr bum, after two very wet and muddy enduro races the the taped seam around the bum is coming off.
I’m hesitant to spend the crazy money on the mud rides as I can’t see them lasting long either.
Army shorts may be next but as noted they are very baggy and flappy
Edit
What does work though is a good pair of water resistant 3/4 bibs under my shorts if its cold enough