The M2 can be configured in one of three options: Anti-Thrust, Wedge, or Zero Elevation. The Anti-Thrust is ideal for the user who slides forward. The Wedge features a higher front to help prevent the user from leaning too far forward. The Zero Elevation has a lower front height to give greater freedom of movement for the user. A four chamber gel section helps keep the gel in place to provide maximum comfort and pressure relief.