This allows the tack to slide up and down the forestay to adjust the luff tension. On racing boats, the tack of the asymmetric is often rigged to a retractable bowsprit, which increases the foretriangle area and prevents interference with the jib. As this trend becomes more popular in racing boats, it may result in similar adaptations to cruising boats as well. Jibing with the asymmetric is much less complex than the symmetric, due to the lack of the spinnaker pole. Much like a jib, all that is required is to change sheets. However, since the asymmetric still flies in front of the forestay, the operation is reversed. The loaded sheet is slackened, and the opposite (lazy) sheet is pulled in, which allows the sail to pass around in front of the forestay, and then be sheeted in on the new lee side of the boat. Retrieving the asymmetric is similar to the process for the symmetric. The sheets are released, allowing the sail to collapse to the front of the boat. The foot of the sail is then gathered, and the halyard released and the head of the sail lowered, where it is packed into the turtle. The "dousing sock", "spinnaker sleeve", "snuffer", or just "sock", is a device used to make deploying and retrieving the spinnaker a much easier task. The sock is a long fabric tube with a ring in one end to hold it open. Since the spinnaker is stored in the sock, the first step is to set up the sock. Two lines are attached to the sock; one is attached to a bridle on the ring, for pulling the sock down, and one is up the inside, from the ring, through the top, and back down, for raising the sock; these lines may be two ends of the same line, to form a loop. The head of the spinnaker is attached the top of the sock and the ring runs down to the tack. The resulting bundle is stuffed into the spinnaker bag. The top of the sock will have provisions for attaching to the spinnaker halyard. The spinnaker is raised as normal, but with the sock in place the spinnaker is unable to catch the wind. Once the spinnaker is raised and the guys are ready to set, the sock is raised, releasing the spinnaker. The sock remains bundled up at the head of the sail while the spinnaker is deployed.