Dedicated Wing
 
As your skillset improves, you'll be wanting to move down to a shorter board. Not as versatile as the cross-over foil Slabs, wing-specific boards are a fair bit short, but  still provide enough volume to stand on to get up and going, but are a little harder to lift and start flying. 
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But once you get up and going, the shorter lengths, with less swing weight are a joy to fly and surf.
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The ability to still float whilst getting going being the key, for once you go too small, you start being in no mans land.