My sock does not cover the last two feet of the spinnaker. It is stock from the sail maker, paired with the spinnaker. Having said that I sometimes feel that it is not long enough when trying to douse, but I am sure the manufacturer knew what they were designing. I like my set up, don't think a furling system would work on my O'day 30. Having said that I always seem to struggle raising it. Multiple tries to untwist the sail inside the sock seem to be a natural process each time I bring it up from below. Someone on our list may have the answer to that, so please do share.