Solid sails are said to be way more efficient. The requirement to keep the flipping function is probably the big engineering obstacle. I'm surprised speed sailors, having gone the first step with asymmetric fins, still tolerate the constraints of flippable sails and symmetric boards.
It's Andrea Baldini who is testing the sail for Challenger Sails. What you see here is in essence an 'addon' for your ordinary sail to make it an asymmetrical one. I have a hard time describing it, but it's basically a 'bag' that you can pull over your existing sail, at least that's what I read somewhere else a while ago.
It must weigh a tonne. The gloves would come in handy for the haemorrhoid cream after the stress of getting it out of the water. 
