DWR repellency means that the boardshorts' outer layer is treated to repel water—obviously a feature that’s not terribly vital if you’re swimming or engaging in activities that have you fully submerged in water. But DWR does make a difference when surfing, fishing, paddleboarding, and enjoying other aquatic activities, keeping the boardshorts dry and light. DWR also allows boardshorts to function well as a non-aquatic casual option akin to regular shorts.