I have keela ski pants which have been very good and very hard wearing.
When I bought them they supplied various mountain rescue outfits in Scotland, can’t say if that’s still the case but was a great recommendation at the time.
The key with clothing of this nature is the waterproof ness and the breathabilty. Goretex are the kings and others imitate. Waterproof ness needs to exceed 20k mm to really be waterproof....