A symmetrical spinnaker is a type of sail used primarily for downwind sailing. It has a shape that is symmetrical along its vertical axis, allowing it to catch wind from behind the boat effectively. This design helps maximize speed and stability when sailing with the wind at the back. Typically made from lightweight materials, symmetrical spinnakers are often used in racing and cruising. They require specific rigging techniques, including the use of a spinnaker pole, to hold the sail out and maintain its shape. Proper handling of a symmetrical spinnaker can significantly enhance a boat's performance on the water.