When we build new main sails, we find that the new sails will not fit under the old covers. Many wish full batten or partial full batten systems for ther mains. With the new main we can build a new main cover as well. We use Sunbrella Acrylic for years of wear and twistlocks to finish the front and close the bottom of the cover. We also produce Tiller Covers, Winch Covers, and Boom Tents.