Building on the success of the Sir Isaac running shoe, Newton Running has just rolled out the latest version of the popular guidance trainer, the 2013 Sir Isaac S.

Available now, runners looking to achieve a more natural foot strike can grab a pair of the highly responsive sneakers at running specialty stores around the country. While the performance upgrades on the latest version seem to be minimal—in fact, the only real difference seems to be a slight drop in weight (0.2 ounces)—Newton is now offering it in fresh, summer-friendly colorways.

The Sir Issac S comes with Newton’s patented Action/Reaction technology in the midfoot and heel that mimics the natural motion of the foot. Also present is a tweaked chassis for better support and flexibility. A highly-breathable mesh upper offers proper temperature regulation, and a 4.5mm heel-to-toe offset provides a low-to-the ground ride.


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