DWR stands for Durable Water Repellent, and it's a treatment applied to the outer fabric of your snow pants that makes water bead up and roll off instead of soaking into the material. Even if your pants have a waterproof inner membrane, DWR is essential because it prevents the outer fabric from getting saturated—which can make you feel cold and damp, even if water isn't technically leaking through.
Over time, this coating naturally wears off from friction, washing, and regular use. When you notice water no longer beading on the surface and the fabric starting to look soaked, it's time to reapply. You can easily restore it using a wash-in treatment or a spray-on product designed for technical outerwear.
To keep your DWR lasting longer, avoid using regular laundry detergent, which can strip the coating. Instead, wash your snow pants with a specialized technical wash. Proper care ensures your pants stay breathable and waterproof season after season.