In most cases, W/R products imply the dual requirements of "DWR + basic water resistance":
DWR allows water to bead off (surface repellency), while basic water resistance reduces penetration, preventing moisture from entering the lining. The combination of these two ensures a "wet-resistant" experience during daily water contact. Water resistance alone is ineffective, allowing water to easily adhere and penetrate. DWR is crucial for achieving a superior water-resistant experience.
W/R products may also undergo hydrostatic pressure testing:
The required value is lower than for WP products, such as 5000mmH2O. Some everyday waterproof clothing uses a lower pressure value to verify basic water resistance.
Outdoor brands in the US market use the AATCC 35 test method, which typically requires the following results:
If claiming water resistance, <1gm @ 600mm @ 2 minutes. This is also the entry standard for US Customs. This means that if a garment claims to be waterproof but fails to meet this requirement, it could be subject to false advertising and could result in product seizure. Under chapter 62 of harmonized tariff schedule of the United States, No more than 1.0 gram of water penetrates under 600 mm pressure after 2 minutes duration.
