Mystic Marshall Seat harness is perhaps one of the most advanced seat harnesses out there. It has a so-called flex shell, to offer you more support during kite surfing. The Marshall Seat combines support with optimal freedom of movement. The preshaped seat cup fits perfectly to the shape of the body and offers extra support in the lower back. The kite's forces are very well distributed to the lower back, so you can kite longer without suffering from your back.