Thanks guys - I was so stoked when I saw the footage from Nicks 200fps camera and even more stoked when I saw what came out of the Gopro on a stick footage - he's a legend (think crane-jump
)
The impact vests have come about because we do a lot of racing with the surfskis and they are required to wear a pfd with minimum 6kg flotation. So we asked if we could use either full wetsuit or an impact vest and they said it was ok. The full wetsuit is too hot once you stop falling in (the water is 10-14deg). There is no legal requirement to wear anything but the impact vest gives a little warmth while still letting the sweat leave the body.
What we do take very seriously is the leash as a lost board will result in a long cold swim where the neoprene impact vest will be borderline sufficient should you need to swim back in.