Ocean Rodeo produced a nice video where Jeremie Tronet explains the ins and outs of the Session 2 Harnass:
 
Kevin Mc Lellan about the Session II:
The Session Harness is without doubt the toughest kite harness out there! With adjustsable/removable leg straps, the Session can be used as either a variable height seat harness or purely as a waist harness. The Session is extremely comfy, with substantial internal padding and spreader bar pad to eliminate any ride up. The Session also has an integrated handlepass leash attachment loop with emergency release! I cannot recommend this harness enough! It saved my back and brought comfort back into kiting with a waist harness.