Ski knee pads range from about 150g to over 500g per pair, and weight matters more than you might think—especially if you're skiing all day. Lightweight pads under 300g feel barely there and are great for recreational skiers who want basic protection without noticing they're wearing anything. The 300–500g range is the sweet spot for most all-mountain skiers, offering solid impact protection without wearing you out.
Pads over 500g are built for heavy-duty use like racing or aggressive freeskiing, but they can cause noticeable leg fatigue on long days. The key is balancing protection with comfort—don't sacrifice the padding you actually need just to save a few grams, since a bruised knee is worse than tired legs. But if you're just cruising groomers, ultra-heavy pads are probably overkill. Think about how long you typically ski and how hard you push yourself, then choose accordingly.