With the same shape as the legendary Sixam 2.0, the Siege is incredibly responsive! A tunnel concave makes edge changes effortless, and the ski turns on a dime. A softer flex and increased rocker make this ski feel stable right out of the box and ideal for skiers from beginner to pro levels. The O'Brien Siege is a streamlined ski that's designed to deliver speed and stability. Small defined bevels mean faster, easier turns. Adjustable ARC fin. Pro Wing foil not included.