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Everyone at Newton Running wants to make sure you love your shoes. If you have questions, concerns or thoughts about your Newton shoes, we are here for you.

When you call us, you will talk to a real live Newton Running expert – maybe even our Cofounder, Danny Abshire. We're prepared to offer you not just the best shoes, but the best customer support anywhere.

Adjusting to your Newton shoes
Choosing the size for your needs
Finding your foot type

Most popular FAQ’s

Sizing, Model and Fit

What size should I get?

Please use the ShoeFitr application (located on each shoe page) in order to help with an accurate size estimate.

How do I know if my shoes fit properly?

The proper fit in your Newtons should give you about a thumb's width from the end of your longest toe to the end of the shoes. This should ensure that the raised lugs on the midfoot are fairly centered under the ball of your foot to allow you to hit your sweet spot on every stride!

Is it okay to use orthotics with Newtons?

Yes. Simply remove the insert that comes with the shoes and replace it with your over-the-counter insert or custom orthotic.

For custom orthotic information, please contact the Newton Running Lab at 303.494.0321

Do you have a wide model?

Yes, the Sir Isaac Wide Guidance Trainer accommodates a 2E width foot. However, all of our shoes have a more anatomical fit with a roomy toe box and a flexible mesh upper that tends to work well for runners with a wider foot.

Shoe Facts and Details

What should my wear pattern look like?

Newton Running shoes are designed to show wear from the outside-in and your unique wear pattern can give you great feedback about your form and technique. Flip over your shoes and take a look!

Ideally, you should see most of the wear centered on the front third of the lugs under the ball of your foot and  little friction wear on the heel or toe of the shoes.

For more information on your wear patterns, check out our customer corner video

How many miles will my Newtons last?

All Newton Running shoe models other than the MV3 and Tri Racer have an average lifespan of 350-500 miles (500-800 km).  The MVand Tri Racer are racing flats with a 150-200 mile lifespan.

If you'don't keep track of your mileage, you can usually tell when you need to retire your current pair based on how they feel - once your Newton shoes are no longer giving you the same "pop" they once were, it is probably time for a new pair.

How do I clean my Newton shoes?

We recommend hand washing your shoes using warm water, a mild detergent, and an old toothbrush. Be sure to let the shoes air dry as well.  The insoles should also be cleaned by hand, or if they get past the point of cleaning, simply replace them with an over-the-counter replacement insole such as Spenco.  

Where are Newtons made?

Newton Running is a Boulder, CO based company – all the design, research, and wear testing is done here locally, and our shoes are produced overseas in our factory in China.  

Adjusting to the Shoes

Can I rotate my Newtons with my old shoes?

As you transition to your Newtons you can continue to rotate them with your more traditional running shoes. When starting out, we recommend using your Newtons for 15-20 minutes at a time and your other shoes for the rest of the mileage you want to log as this will help you adjust to the more level platform and unique technology in our shoes. You'll notice that the more you're in your Newtons, the less you will want to be in your old shoes!


My calves are sore. Are yours?

Running with a more natural running technique engages the Plantar Fascia, Achilles tendon and calf with every foot strike. These muscles and tendons work very efficiently in unison but they are tiny and, therefore, susceptible to fatigue. Some slight soreness as you adjust to your Newtons is totally normal and nothing to worry about - it just takes some time to build strength and lengthen those muscles and tendons so be patient and take your time breaking in your shoes.

How long will it take to adjust to my Newtons?

Every runner is a little bit different in how long it will take them to adjust to their Newtons as it depends on a lot of factors - for somer runners it takes a week and for others it may take months. We recommend starting with 10-15 minutes of running in the shoes and building up gradually from there. Click here for more information about the transition.

Running Form & How to use Newton Shoes

Can I run long in Newtons?

Definitely!  Your Newton shoes are built to take whatever distance you want to log in them, whether it's 5 km or 500 km.  The only models that are built specifically for shorter distances are our racing flats the MVand Tri Racer.

Can I run in both my Newtons and traditional running shoes?

As you're adapting to your Newtons, we recommend that you switch back and forth with your traditional shoes. However, once you have completely adjusted to your Newtons, they are designed to be your full-time training and racing shoes.  

How do I run midfoot downhill?

Running downhill with a midfoot strike takes a bit of time to master.  A confident, rapid leg turnover will allow you to stay on the midfoot while continuing to accelerate on the downhill. Keep your feet level to the ground rather than pointing your toes down and stabbing the ground or overstriding and braking with your heel. Watch a demontration here

Good resources and information on Natural Form Running

Newton Running Cofounder Danny Abshire’s book Natural Running is an outstanding resource for people interested in learning more about running efficiency and form. Other resources include: