The flowboard is designed using the DeepCarve system, which enables a 45 degree turn ability, like a surf/snowboard, rather than the standard 25 degrees on a skateboard, while maintaining stability.
A flowboard usually puts pressure on just 2 wheels on the board, rather than 4. This more focused weight distribution requires slightly more effort into keeping the board moving. For this reason, it is often ideal to ride it on downhill slopes.
Check out this 2003 Flowboard commercial below...
via youtube gizmodo