What is DWR?

Durable Water Repellent (DWR) is a textile treatment applied to fabric used for clothing, including headwear. The treatment prevents water from saturating the fabric and instead causes water to bead up and roll off the surface, keeping your hat (and head) dry. There are several different types of DWR coating. The DWR used as a standard for many years by the textile industry was called C8 DWR, which is a long-chain, fluorocarbon-based coating containing per- and poly-fluoroalkyl substances, also known as PFCs or PFAS. Although C8 is very hydrophobic and the most effective DWR, its byproducts can be toxic and remain in the environment for many years. They're also bioaccumulative. As an alternative to C8, C6 DWR was developed several years ago. It is a shorter-chain, fluorocarbon-based coating, the byproducts of which break down faster and are less toxic to humans and the environment. More recently, C0 (C Zero) DWR was developed and it is fluorine-free (i.e., PFC/PFAS-free). C0 DWR provides excellent water repellency and durability, and it has the lowest impact on the environment. Wherever possible, we use PFC/PFAS-free DWR to ensure the safety of factory workers, customers, and the environment. Look for the "PFC/PFAS-free DWR" call-out on our hats.