Kitesurf Harnesses are broken down into two categories: Seat or Waist Harnesses.

Seat Harnesses generally have a lower spreader bar position (this makes it easier to be lifted up out of the water, and not over the top of the board) and will not lift up when the kite is above you - so is ideal for beginners and intermediates

Waist Harnesses have a higher spreader bar position (this makes it easier to jump and spin in the air), and give more freedom of movement, but will ift up if the kite i above you - so are ideal for Intermediate and advanced riders.