Captain navy Sunbrella in like new condition Stack Pack style mainsail cover. Open at bottom to attach below boom with tabs or with twist lock fasteners on boom. Reinforced tabs along sides of top for lazy jacks to hold up in place. Front zipper to fasten in front of mast. Heavy duty YKK zipper along the whole top of cover to drop sail into cover and zip up. Sleeves on both sides to add stiffness with batten/rod or not will work both ways. Reinforcing on inside of cover near mast. 13’9” long, 2’ tall at front tapering to 9” at back of cover(outhaul) Made for any size boat that the sail will stuff down into it. Makes dropping and storing sail easier than a regular Sailcover. Very expensive to have one made.