Well spotted Seabird
We use three head sails , the original dacron one that goes on the furler that we use when it is blowing hard, and 2 larger (to big to fit on the furler) Doyle Stratis Ice head sails (battened so they don't furl) that are the same size, that run up the foil on the furler, attach a hard point on the deck and to the top bearing on the furler and have to be dropped on the foredeck when we put a spinnaker up
The lighter one is rated at 0 to 14 knots and the second heavier one is rated at 6 knots and above
The one shown on the boat in this photo is the heavy one
These photo's show the attachment point
Regards Don