The outermost fabric of a VIEV garment is treated with an ultrathin coating called a durable water repellent (DWR) finish. This coating causes water to bead up and roll off, instead of being absorbed. DWR-treated fabrics provide additional water protection and prevent liquid from penetrating the outer fabric: a condition known as "wet out" that can make you feel damp and clammy. Regular wear, plus exposure to dirt, detergents and other impurities, can cause the DWR to wear out over time. The effective life of the DWR depends on how you care for your garment and how rigorously it's used. The best way to maintain your garment's water- and stain-repellency is to simply keep it clean by regularly washing it and putting it in the dryer to heat-activate the DWR. Be sure to read the care tag in your garment for specific instructions.