A 5,000mm waterproof rating means the glove has a basic waterproof membrane that handles light snow and occasional powder without soaking through. For casual resort skiing on typical days—especially in drier climates like the Rockies—this level of protection keeps your hands dry and comfortable without paying for more than you need.
The limitation shows up under sustained wet exposure. If you're leaning on wet surfaces, sitting on a snowy chairlift for long stretches, or skiing in heavy precipitation, moisture can eventually work through. These gloves also aren't ideal for deep powder days where your hands are constantly plunging into snow.
5,000mm is a smart choice if you mostly stick to fair-weather resort days and moderate conditions. But if you regularly ski in wet coastal climates, encounter heavy storms, or spend long days out, stepping up to 10,000mm gives you more reliable protection without a huge price jump.