vingli boat cover heavy duty 600d polyester waterproof uv resistant marine grade, durable and tear proof, fits 17-19 feet v-hull, tri-hull fishing ski pro-style bass boats - black vingli <p>how to select the correct boat cover size for your boat?</p> <p>1. measure the center line length.(straight measurement from bow to stern,not includes the motor, make sure include tolerance for excessive bow rail heights, trolling motors, ladders, and transom platforms etc., do not to measure up and over the windshield)</p> <p></p> <p>2.measure the beam width.(straight measurement for the widest distance across the boat, flat line from side to side at the widest point on the hull. do not measure up and over the windshield)</p> <p></p> <p>3.look for the boat cover description which represents best to your boat style. move up to the next size if your measurement falls on maximum length.</p>