I get cold when I ski, colder than most people.
For that reason on a genuinely cold day I wear two fleece gaiters around my neck. This is in normal times, when the temps reach the 20s in ºF or lower. Higher, I wear one gaiter.
In lift lines, on lifts, and usually while skiing, I pull one of those two fleece gaiters up over my mouth and cheeks, allowing just enough room above it for my nose to be clear to breathe. This is pre-covid.
My nose drips in the cold. It drips onto the gaiters, and freezes. This is normal for a ski day in NE for me. What I do when the gaiter gets saturated with ice is shape it with my hands into a wall in front of my mouth, out from my face, not touching it. That stiff frozen wall blocks the cold wind coming at me as I ski. It holds its shape. It's a good thing.
If I'm exerting extra energy skiing, I will pull the stiff gaiter down to allow me to breathe with my mouth as well as my nose. As I do this I keep the sides up to cover my cheeks. Sometimes I wear a balaclava under my helmet that offers a thin cheek covering along with these gaiters. It's a rare warm day when I use only one gaiter and no balaclava.
I change out the fleeces at lunch. I have about 20-30 of these things I've picked up at thrift shops over the years. The ones I've used get washed every weekend. I don't consider it gross.
So as people are considering pulling up a tube over their noses and mouth, contacting both, and consider standing in lines and riding chairs like that, I wonder about the nose drip and the ice. It's not something I'd even consider doing, given my experience with the fleece gaiters. Maybe my nose drips more, or maybe my breath has more moisture in it. I don't know.
Maybe the wicking for those thin tubes will help to avoid ice build-up. I don't use those thin tubes because I've been more focused on the warmth that two layers of fleece offers.