DWR is science at work.
Have you ever seen how many drops of water you can put on a penny in a science class? (Try it if you haven’t, it’s really surprising.) The water stacks up and forms a tall bubble.
The tall water droplet has a high contact angle with the penny. When the droplet finally bursts and the water spreads out, the contact angle is very low.
Similarly, an effective DWR treatment keeps water droplets at a high contact angle with the fabric of the rainwear.
This minimizes the surface area of the wetted fabric and better allows water droplets to roll off. Less water on the outer fabrics allows the technical waterproof fabric to breathe its best which helps keep you more comfortable.
More importantly, keeping dry is a vital component to staying safe on any adventure.
DWR treament is very important for ski jackets.
