Facts

Discontinued
Terrain

Road

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

Trail

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 high or medium high arches. See the best neutral shoes.

Stability / overpronation / normal arch

Shoes for runners who need arch support (Around 45% of runners). Best for runners with a normal 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.

Daily running

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

Competition

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
$150
Show more facts

Road

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

Trail

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.

Neutral / cushion / high arch

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

Stability / overpronation / normal arch

Shoes for runners who needs arch support (Around 45% of runners). Best for runners with a normal arch. See the best stability shoes.

Motion control / severe overproanation / 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.

Daily running

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

Competition

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.

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.

Summary

We spent 9.4 hours reading reviews from experts and users. In summary, this is what runners think:

6 reasons to buy

  • Closed mesh keeps small debris out while maintaining a breathable and comfortable coverage based on the reviews of several runners.
  • Most reviewers welcomed the inclusion of the Enhanced Sock Liner, which gives a return of energy to the runner, as well as protection.
  • Runners get stability and additional support from a Midfoot Chassis or Shank.
  • The single-density EVA offers high rebound capabilities to runners of all types as noted by a few testers.
  • The Action/Reaction Technology found in the forefoot area absorbs energy and then gives back the energy to the runner for an efficient performance, according to a handful of users.
  • The sufficient traction is provided by the beveled lugs.

3 reasons not to buy

  • Some reviewers noted that it wasn’t as resilient when it came to the cushioning aspect because they experienced pain when they used it for longer periods of time.
  • Others noticed that the structural integrity suffered after a few uses.
  • A few felt that it was half-a-size smaller than what they were used to.

Bottom line

The Sir Isaac S from Newton brings a responsive ride to runners who want to perform well during their athletic activities. It’s a supportive shoe that keeps the foot stabilized and balanced.


Rankings


Ratings

4 / 5 based on 7 ratings

5 star
43%
4 star
14%
3 star
43%
2 star
0%
1 star
0%

My Rating


Updates to Newton Sir Isaac S

  • The Newton Sir Isaac S is a daily running shoe that offers support for those who have mild over pronated foot motion. It has mid-sole components that essentially balance the foot to assume a more natural stance when running, thus preventing discomfort or injury during the activity.
  • The upper unit has been constructed to provide optimum protection for the foot. Durable mesh makes up the main upper material. Its closed construction makes sure that debris and dust won’t be able to enter the shoe. It still is breathable, so the foot stays dry and cool at all times.
  • The mid-sole unit of the Newton Sir Isaac S uses many proprietary technologies that deliver sure underfoot cushioning and stable performance to the runner. Support and stability are also afforded by mid-foot units that act as foundations for the arch. A more balanced running stance is achieved by these helpful units.
  • Durable rubber covers the outsole unit of this running shoe. This external layer effectively protects the rest of the sole unit from damage or wear during activity. Traction is also given because it is able to hold onto the asphalt capably. Essentially, the outsole is able to stay resilient even after many miles.

Newton Sir Isaac S size and fit

The Newton Sir Isaac S is true to its size. The men and women’s versions of this shoe follow the regular measurements when it comes to length. The heel, mid-foot and forefoot sections have medium widths, so this shoe accommodates those with medium sized feet.


Outsole

Carbon Rubber is placed in the heel area. It has been created to provide durable protection, even after many uses and long periods of time. It shields the sole unit from damage and impact, keeping the platform intact.

A High Density Rubber is placed in the forefoot section. It makes sure that the outsole unit lasts longer. Much of the surface abrasion may focus on the forefoot section, so a denser rubber compound extends the life of the external layer.


Midsole

Placed right against the foot is an EVA mid-sole foam. This is a durable and responsive layer that offers adequate cushioning and protection for the foot. It doesn’t wear off easily, so it stays efficient even after many uses.
The Second Generation Action/Reaction™ Technology is used in the rear and front sections of the shoe. External lugs compress and absorb the energy from landing the foot on the ground. They release said energy during the toe-off as they deliver a trampoline-like propulsion.

A Dual Density Posting goes from the mid-foot to the forefoot section, making sure that it is able stabilize the stance of the runner.

A thermoplastic piece in the mid-foot section called the Support Chassis adds more stability while also retaining & preserving the structure of the shoe.

The Met-Flex grooves on the forefoot area allow the foot to move more naturally, particularly during the toe-off phase where the metatarsals are naturally bent.


Upper

Closed Mesh is the main upper fabric of this running shoe. It offers breathable and comfortable coverage, so the runner stays cool and dry while wearing it. Its closed construction prevents any debris or dust from entering the shoe.

The overlay system has been anatomically tuned to deliver a secure and reliable fit that’s also customizable. These are connected to the lacing system, so the tightening or loosening of the shoelaces determines how the upper actually feels against the foot.

The Metatarsal Stretch Panels in the forefoot section prevents any irritation as it actually gives space to the foot to move more freely without feeling too tight while wearing the shoe.

Slip-Proof Laces lock in place and don’t get unraveled easily. Double eyelets offer additional heel security because, when used, they let the laces pull the collar forward. It’s an efficient way to keep the foot in the shoe and in place.