DWR (Durable Water Repellent) coating makes water bead up and roll off the fabric surface, but it's not truly waterproof. Think of it like a water-resistant windbreaker—it handles light moisture but won't stand up to a full day in heavy snow or wet conditions.
DWR-only jackets work well for spring skiing, bluebird days with light snow, or casual resort riding where you're taking indoor breaks. They're very breathable and typically more affordable, which appeals to occasional riders or those on a budget.
The catch is that DWR coating wears off over time and needs reapplication. More importantly, if you're skiing in steady snow, deep powder, or wet coastal conditions, a DWR-only jacket will eventually soak through. For most skiers and snowboarders, a jacket with a proper waterproof membrane (like GORE-TEX or a quality proprietary membrane) is the safer bet for reliable all-day protection.