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. MC, X and J Boat covers have 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. Please contact us for Sunbrella Acrylic pricing option and color selection.