The Newton Sir Issac S is a natural, daily running, support shoe designed for a mild overpronated foot motion; ideal for first-time Newton users.
The Newton Sir Isaac S provides support for over-pronation while encouraging a midfoot/forefoot striking pattern. Thanks to actuator lugs in the forefoot, the Sir Isaac S provides excellent shock absorption and energy return. This shoe is great choice for runners who have been in traditional support shoes, but now want to try moving up on the foot to be more "natural".
The Sir Isaac S 2012 is a moderate feature, moderate support shoe designed for racing, daily training and high mileage.