When we're swing flies for steelhead or salmon, stripping flies for trout or bass, we seldom think about how the fly swims. We're left guessing at which depth the is swinging and often our assumptions are wrong. Downforce flies aren't one particular pattern, rather it is a style of fly tying. These flies get down on their own and stay down. They don't have to be dragged down with a heavy sinktip. these characteristics ensure that these flies get where they are supposed to go and then stay there.