Stack-style sail cover for your Alerion Express 20 Sail Cover. This product is made from marine grade Sunbrella. Marine-grade Sunbrella is a material that has unparalleled performance because it is UV / Fade Resistant, Mold / Mildew Resistant, Bleach Cleanable, Sun Protection, and Breathable Comfort. Sunbrella stands behind their marine grade products with a limited ten-year warranty that covers color or strength loss from normal usage and exposure conditions, including sunlight, and mildew. Sail cover includes a # 10 Ykk zipper in front of the mast, a Velcro mast collar and utilizes common sense fasteners along the bottom edge. We use quality materials to build a cover that is meant to last. All of our product are made in Bristol, RI.