I use less expensive older parkas
I just washed an old parka, hung it out to dry, and then
sprayed it with the "water proofing liquid" that I save big on by doing it myself.
Been using the auto supply version, at less cost, by myself, whether it was tents, boots or outdoor or fishing jackets.
Of course, you have to be old to know an old parka has worked in the cold. Of course, I have a couple of shetland wool sweaters I wear under parkas in real cold weather -minus zero weather.
Of course its a miracle to know they work too. And an even greater miracle, in this age, that they fit after more than forty years.