The Beast and Ariel have the reputation as the Brooks shoes you go to if you need full on stability. But the Addition actually also does a good job in that department. The medial posting extends two-thirds of the way along the shoe for a really stable feel. new colour for the second part of 2007.
These are a good supportative shoe (motion Control) whilst remaining light. I usually use a support shoe but due to achilles tendon injury have moved to this motion control shoe.