For most casual resort skiers, 20,000mm waterproofing is more than you need. But if you ski in coastal or Pacific Northwest climates where snow is heavy and wet, this high-end rating is a game-changer. It's also essential if you're a ski instructor, guide, or someone who spends full days out in deep powder where your hands are constantly pushing through snow.
The 20,000mm rating means the membrane can withstand serious water pressure before leaking—think leaning on wet surfaces, digging out your car, or repeated plunges into deep snow. Lower ratings can eventually seep through under that kind of sustained contact.
The trade-off is breathability. These gloves may trap more moisture from sweat, so your hands could feel clammy during high-output activities like touring. If you're mostly skiing dry, cold interior snow or fair-weather resort days, a 10,000mm glove will keep you dry and breathe better. Save the 20,000mm+ for the wet stuff and long exposure days.