Newton Sir Isaac

8.5
8.5 score
[Editors rating (8.5)] = Runnerclick score (8.5)/10

Our RunnerClick score is based on our editors overall rating compared to the user ratings in order to generate the most accurate and unbiased score of each product we review.

If there are less than 10 user reviews for the product in total, the weight of user reviews is decreased from 50% to 25% to make sure that new products are not rated too high.
0
Editor rating: 8.5 / 10
User's rating: based on 0 user ratings
1 star
0%
2 star
0%
3 star
0%
4 star
0%
5 star
0%
Add your Rating
All Newton Running Shoes
Newton Sir Isaac Review Facts

The Newton’s Sir Isaac road running shoe is a neutral shoe for the runner who needs a little extra help and support to improve their gait. This shoe includes design elements that help the runner with pronation issues. This creates a more natural gait and over time, reduces the risk of injury.

The star of these shoes is Newton’s patented Action/Reaction technology. It gives the shoe a springy, almost bouncy feel. This is good not only for added comfort but also to return energy to the runner and reduce premature fatigue in the feet. The outsole of the shoe also features a unique beveled pattern in the toe and heel. This helps promote a natural movement and guide the athlete through their stride. The beveled heel and toe helps guide runner easily into the midfoot/forefoot, and beveled lugs create smoother transitions. The upper of the shoe is made of a closed mesh material that protects the runner from the debris that the road can toss their way. The low drop supports a natural stride.

Pros

- Runners love the responsiveness and stability features of this shoe.

- Small details like the slip proof laces show that the Newton team is very thoughtful about their products.

- These shoes are true to size so don't be worried about ordering online.

Cons

- Some runners found this shoes to be outside of their ideal price point.

Upper
Upper

Upper

The closed mesh of the Sir Isaac Newton offers some pros and cons to the runner. The con is that because it is a closed mesh, it doesn't offer breathability that is as good as some other models. However, the material is lightweight and does allow some airflow to keep the foot cool and dry. The pro is that because it is a closed mesh, the runner is protected from road debris that can get into the shoe and create discomfort and distractions. In addition, the upper comes with an Enhanced Sock Liner. This sock liner adds extra cushioning and comfort and adds more spring to each step. There is also added stitched overlays on the upper to create a customizable fit that can be loosed or tightened through the lacing system.



Midsole
Midsole

Midsole

This shoe features a more traditional EVA midsole foam. This provides a springy feeling, and runners reported that they loved the high responsiveness that this single layer of EVA foam provided them. This shoe also offers a higher level of support through the midfoot. It keeps the foot stable and reduces unwanted movement, allowing one to focus on improving their form and gait.
Outsole
Outsole

Outsole

The Sir Isaac uses carbon rubber in this outsole. Carbon rubber is the same material used in race car tires, and it is extremely durable and is designed to protect the rest of the shoe from wear and tear. The Carbon rubber outsole also gives the shoe a high level of traction that other shoes in this category don't provide. In addition to the high durability of the carbon rubber, the underfoot design of this shoe offers beveled lugs and the Newton's patented Action/Reaction technology. These features create superior grip and promote forward movement. Runners reported that these features helped them reduce fatigue and the outsole actually returns energy to the runner.

Weight
Weight

Weight

At just under 11 ounces (10.9 to be exact) this shoe is one the heavier side. For the runner looking for a lightweight racing shoe, the Sir Isaac Newton is not the optimal choice because this shoe has support and stability features that increase its weight.
Breathability
Breathability

Breathability

Runners commented that the breathability of these shoes is not as good as some others in this same category. The upper of the shoe uses a closed mesh construction. This is good because it keeps the runner safe from debris on the road, but in terms of breathability, it does limit the airflow. This doesn't mean that these shoes offer no ventilation. They do offer the runner some temperature control and runners reported that their feet did not feel too hot or uncomfortable on longer runs.
Style
Style

Style

Newton shoes are known for their stylish aesthetics, but the Sir Isaac's fall short of the signature look of their brand. Runners reported that the shoe lacked the flair that they have come to expect from the Newton line, and while most of their shoes are brightly colored, the Sir Isaac's primary color is white.
Comfort
Comfort

Comfort

This shoe receives high marks from runners for its added cushioning features. The upper of the shoe is made using a closed mesh which protects the foot from debris from the road. This keeps the runner comfortable and safe from unwanted debris. The midsole is made from a traditional EVA foam that adds cushion and spring to each step. Finally, the Enhanced Sock Liner wraps the foot, creating a glove-like feeling. It also features stitched overlays that allow the runner to customize their fit.
Durability
Durability

Durability

The outsole of this shoe features carbon rubber, which is an extremely durable material. This rubber prevents wear and tear and protects the rest of the shoe by absorbing shock and deflecting road debris. Additionally, the outsole features a unique beveled lug system that protects the rest of the shoe from breaking down too quickly. The traditional EVA foam is known to stand up against long, tough miles. The closed mesh of the upper is also more durable than some other materials and runners reported that it helped the upper of the shoe stay newer looking longer. All in all, runners were happy with the durability offered in this shoe.
Protection
Protection

Protection

These shoes are best at protecting runners from injury inducing gaits. The shoe is designed to help runners who struggle with pronation issues. If a foot is turning inward too much, it can cause discomfort and pain over time. In addition, the upper of the shoe is made from a closed mesh and includes stitched overlays. Both of these provide protection to the runner from the elements of the road. The upper of the shoe is also water resistant. Between the water resistant upper and the added traction in the outsole, runners liked this shoe for adventure in the rain or snow.
Responsiveness
Responsiveness

Responsiveness

Newton prides themselves on creating ultra responsive shoes. The midsole and outsole are cushioned enough so that they are very comfortable, but they are not so plush that it feels like running on s squishy pillow. Runners used the words "springy" and "bouncy" to describe the fit of the Sir Isaac. The forefoot Action/Reaction Technology absorbs energy from the road and sends it back into the foot. Runners reported feeling very connected to the road, and because of the flex grooves of the outsole, the shoe is also quite flexible.
Support
Support

Support

Runners reported that this is a very supportive shoe. The tradtional EVA midsole foam is firm with comfortable cushioning. It also comes with a forefoot Action/Reaction Technology that provides pronation support to the runner. The shoe limits the inward rolling of the foot to improve a runner's overall gait and reduce the potential for long term injury. In addition to the supportive midsole, the upper of the shoe features stitched overlays to keep the foot in place and provide a snug, comfortable, and customizable fit for the runner.
Terrain
Terrain

Terrain

This is a shoe that is suggested for road running. while there are many great trail shoes out there, this shoe is not a shoe for your extreme off-road adventures. The underfoot does come with flex grooves and added traction, so a groomed trail wouldn't be an impossible option, but overall, this shoe excels on roads so you'll want to stick with that.
Price
Price

Price

Every runner has a budget, and it is important to find a shoe that you and your budget are comfortable with. There are lots of great shoes on the market that are very affordable, but the Sir Isaac falls at the higher end some runner's budgets. With an MSRP of $150, this shoe is about thirty dollars higher than the average price for a quality running shoe. It is worth noting, however, that runners did comments on the durability of these shoes. They do last longer than some of their less expensive counterparts, so they can be seen as an investment.
Traction
Traction

Traction

The carbon rubber outsole isn't only durable, it also offers a higher level of traction to runners. Runners reported feeling protected and confident regardless of the road conditions because of the gripping underfoot of the Sir Isaac. Some runners even commented that they felt safe runninging in the rain or snow in these shoes.
Flexibility
Flexibility

Flexibility

The deep flex grooves found in the outsole of these shoes makes this a very flexible shoe. The flexibility adds to the amazing all around responsiveness of the shoe and also promotes a natural gait.
Stability
Stability

Stability

For the runner in search of a good stability shoe, the Sir Isaac might be a great choice. From the upper to the outsole, the shoe offers a variety of stability features to help keep the runner's foot secure and free from unwanted movement. The upper features stitched overlays that hug the foot and secure it in place. The midsole features a midfoot technology called Action/Reaction that responds to movements in the foot, but also helps the runner maintain correct form. The outsole of the shoe is flexible, but the low drop keeps the foot close to the road. The lugs that are spread through the forefoot and midfoot offer a more stable landing space, too. Another unique feature of the midsole of the shoe is the Chassis/Shank material that adds additional stability for the runner.
Drop
Drop

Drop

Something that sets the Sir Issac apart from other shoes is that it is both supportive and offers a low heel drop. At 4 mm, the heel drop of this shoe places it in the minimalist category. With enough weight and cushioning to support the runner, but a lower drop to promote a natural gait, this shoe is certainly unique in its design.
Key Features
Key Features

Key Features

-Carbon Rubber - Carbon rubber in the outsole adds a high level of durability.
- The Action/Reaction Technology found in the underfoot promote energy return and help push the runner forward. This reduces premature fatigue.
- Traditional EVA midsole foam provides a springy ride.
- Enhanced Sock Liner adds an extra layer of cushioning and extra comfort for the runner.
Bottom Line
Bottom Line

Bottom Line

The Sir Isaac is a neutral running shoe that offers extra stability and support. It is cushioned through the midsole and runners love the responsive, energy returning features that help stave off fatigue. Although the upper is made from a solid mesh, it still provides enough breathability to keep the runner comfortable on their long runs. Due to the weight and added support, this has not been reviewed as a fast shoe. The look of these shoes is more classically appealing, rather than being highly trendy or flashy. With impressive main features like the Action/Reaction Technology and a highly responsive midsole, to small details like a highly secure lacing system, the Sir Isaac is a top quality, supportive shoe.