I just finished a product review of the Ridge Line which will appear in the spring issue of Flyfishing & Tying Journal. I liked the line, it handles well and remains supple in very cold water. With its very fine grooves and ridges, I worry a bit, though, about how hard it may be to keep it clean. The (at least) implication that, because only the tops of the ridges contact the guides, there will be less friction is not borne out by physics, which tells us that friction is independent of surface area.