The Olympus 3.5 features a new, more durable upper fabric pattern, but otherwise retains the awesome attributes of the 3 to create a more flexible and stable ride. The combination of InnerFlex as well as a 3mm reduction in stack height creates a midsole that is more flexible and responsive, and when paired with a widened platform and a grooved outsole, the Olympus provides surprising stability on uneven surfaces. Vibram MegaGrip rubber, sculpted in the Altra TrailClaw pattern, continues to provide the traction needed for a variety of terrains.
The 'neutral shoe' or 'cushioning shoe' is equipped without pronation support (the lateral support of the foot). These shoes are therefore suitable for runners who have regular rolling behaviour, i.e. who do not roll their feet inwards or outwards when running. The neutral shoe can be used for competition, for fast training and for long endurance sessions. The damping may vary depending on the application: in order to achieve more direct ground contact during competition, it is advisable to use only a slightly cushioned shoe. When training on hard surfaces or for long distances, more cushioned shoes offer better comfort and protect the joints.