The cover is made of stretchable, waterproof and UV-resistant fabric that's made to conform to your individual seat; in our case, it was the B Series model, which is designed for most metric or H-D Road King models with two-up seats on a single pan (the C series seat for the Triumph Rocket is also shown; an updated fitment chart is at www.kingoffleece.com). The patent-pending, basic black cover is a breeze to install; initially, we just slipped it on, but it looked pretty baggy. Once we removed the saddle entirely, stretched the cover over each corner, and then tightly secured the hook-and-loop fasteners underneath—per instructions—we were much more satisfied with the snug look. Even though our seat is vinyl, there's still stitching water can sneak into, and this easy-on cover has, so far, repelled its share of moisture, sun, and even dirt. Best of all, we can just pop it right off when the forecast calls for clear skies.