Our cockpit cover installs over the boom in front of the mast to the end of boom with a heavy duty marine zipper at the mast, and boom pocket. Grommets with tie down rope secure the cover to the deck. Fabric is gray vinyl coated polyester, water repellent, UV and mildew resistant. Pricing is $65 additional for Sunbrella Acrylic. Please contact us for Sunbrella Acrylic option and color selection.