• Terrain


    Shoes best for road, track and light gravel. See the best road shoes.


    Shoes best for trail, off road, mountains and other unstable surfaces. See the best trail shoes.

    Good to know

    As long as you stick to the road or path, and if you want just one running shoe, buy a road running shoe.

  • Arch support

    Neutral / cushion / high arch

    Shoes for runners who do not need any additional arch support (Around 50% of runners). Best for people with normal, high or medium high arches. See the best neutral shoes.

    Stability / overpronation / normal arch

    Shoes for runners who need mild to moderate arch support (Around 45% of runners). Best for runners with a low arch. See the best stability shoes.

    Motion control / severe overpronation / flat feet

    Shoes for runners who needs a lot of arch support. Best for runners with flat feet. See the best motion control shoes.

    Good to know

    - Rule of thumb: If in doubt, buy neutral shoes to avoid injuries.
    - More about arch support in this video.
    - Find your arch type by following steps from this video.

  • Use

    Daily running

    Cushioned shoes for your daily easy running. Great comfort. See best shoes for daily running.


    Lightweight shoes good for races, interval training, tempo runs and fartlek. Here are the best competition running shoes.

    Good to know

    If you want just one pair of shoes, buy a shoe for daily running.

  • Price
  • Weight
    Men: 11.6oz
    Women: 9.2oz
  • Heel to toe drop
    Men: 4mm
    Women: 4mm

    The height difference from the heel to the forefoot, also known as heel drop, toe spring, heel to toe spring or simply drop.

    There are many opinions about what a good heel drop is. We do not recommend any in particular. Lean more in this video.

  • Heel height
    Men: 27mm
    Women: 27mm
  • Forefoot height
    Men: 23mm
    Women: 23mm
  • Width
    Men: Normal
    Women: Normal
  • Release date
Show more facts

  • The Sir Isaac S was a previously released shoe from Newton, which the brand is now bringing back due to popular demand. This time around, the shoe has been made more structured and more supportive than before, giving overpronators a stable and cushioned ride.
  • The upper retains the usage of the closed mesh material and slip-proof laces, but now has an added lightweight support strapping for ergonomic purposes. Like all other Newton shoes, the Sir Isaac S is cruelty-free and is made from vegan materials.
  • While the sole unit mostly has a similar structure as the original version, the new Sir Isaac S has a slightly higher heel-to-toe drop of 4.5 mm. The outsole introduces a heel rocker that produces an enhanced toe spring.

The Sir Isaac S from Newton has a standard running shoe length, and it comes in a wide range of size options. The shoe stays close to the construction of other Newton shoes, with its moderate midfoot and heel sections that will comfortably accommodate low to medium foot volumes. The Newton Sir Isaac S is available in medium width for both the men’s and women’s versions.

A high-wear carbon rubber makes up the bulk of the outsole of the Sir Isaac S. This material is known to be durable; hence, it guarantees the underfoot a robust protection that would not deteriorate quickly.

A set of high-traction lugs deliver the adequate grip to ensure a smooth ride and hassle-free running experience for the wearer.

The outsole also has a rocker structure that enables a motion that is similar to a rocking chair; this means mobility is natural as possible while also allowing an efficient transition.

The Newton Sir Isaac S utilizes an ethylene-vinyl acetate (EVA) foam midsole that possesses the brand’s proprietary Action/Reaction™ technology. Working in the midfoot and heel areas, this feature creates a responsive system that is like a trampoline. The movement of the lugs in the outsole causes a quicker bounce-back. The Action/Reaction™ technology also reduces the amount of energy loss compared to traditional foams.

Because the Sir Isaac S is a stability shoe, the midsole incorporates a midfoot support chassis to keep the foot stable while running. This detail also retains and preserves the structure of the shoe by acting as a framework.

A medial post is also present, a piece of foam firmer than the midsole itself, that runs from the midfoot to the forefoot. This medial post ensures the runner keeps a steady stance, and, in turn, reduces overpronation.

The highly-breathable closed mesh upper of the Newton Sir Isaac S promises maximum airflow inside and around the shoe. Its unique composition also assures the coverage the foot needs.

The shoe’s overlay system has the same layout as the original version. While it offers reinforcement and structural integrity, it also acts as the “eyelets” as the laces pass through, therefore allowing more or less support depending on how tight the laces are tied.

The shoelaces still have the slip-proof feature, which means they don’t unravel as quickly as standard laces.

A set of metatarsal stretch panels is found in the forefoot section of the Sir Isaac S. These elements prevent irritation and give more space, so the foot could move freely.

The Sir Isaac S also has a lightweight, ergonomic support strapping, which provides ample support and security during the running activity.

For low-light visibility, the shoe includes a reflective printed logo and heel tab.