One of our most popular products! The Ripple and Flat Boat Patches take some of the hassle out of boat or canoe fishing. It works just like an oversized 12"x15" fly boxa | simply mount it on the inside gunnel of your boat or canoe using the adhesive backing. We&';ve been told they&';re also great for trucks, fly-tying benches and as custom-cut liners for odd-sized and wooden fly boxes.