12-13. 5 ft. Aluminum Boat Cover up to 68" Beam - Waterproof 300D polyester fabric. Designed for modified V-Hull boat shapes. Fits 12' to 13. 5' long boats (68" max. beam width) . Includes trailer tie-down straps with loop-ends and integrated air vent. Great for aluminum boats, fishing boats, hunting boats, and more!. Please note: For the best performance of any boat cover, it is highly recommended to use a boat cover pole support system, o prevent water from pooling on the surface.