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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

Which shoe is right for me?

We can help you right here.

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 ideal fit with Newton shoes is with the bones of the ball of your feet directly over the center of the raised lugs on the outsole of the shoes.

This alignment typically offers a thumb's distance of space in front of the longest toe to the end of the shoes.

Is it okay to use orthotics with Newtons?

Yes.  Simply remove the sock liner that comes stock in the shoes, and replace it with your over-the-counter or custom insole.

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

Newton Running: Shoe Facts and Details

What should my wear pattern look like?

Newton Running shoes are designed to show wear from the outside-in.  It’s one of the most helpful bits about our shoes, and your unique wear pattern can teach you a lot about how you’re running.

Ideal wear on your Newtons is with friction accumulation on the front third of the raised lugs under the ball of the foot, and the rear two-thirds showing less wear.  Friction wear in front of the raised lugs represents excessive toe-off; efficiency can be gained by focusing on lifting from the hip flexor at the end of the stride rather than pushing off from the toe.  Mild friction wear on the heel is nothing to be alarmed about.

How many miles will my Newtons last?

All Newton Running shoe models other than the MV2 have a lifespan of 350-500 miles (500-800 km).  The MV2 is a racing flat with a 150-200 mile lifespan.

If you've not tracked your mileage, you can base your need for new Newton Running shoes on how they feel – when you feel like your Newton shoes are no longer giving you the same "pop" they once were, it's time for a replacement.

How do I clean my Newton shoes?

The best way to clean Newtons is by hand.  The shoes are not designed to tolerate the agitation and extreme conditions of a washer/dryer.  We recommend scrubbing them in the sink, using a mild detergent and an old toothbrush.  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 insole replacement 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, but our shoes are produced overseas in our factories in Indonesia and 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?

Everyone's a little different with how they adjust to their Newtons; some take a week, and others take months.  Start with runs of 15-20 minutes, while continuing to log the bulk of your mileage in your traditional running shoes.  The best advice is not to do too much too soon; be deliberate with your time in the shoes, and cognizant of how you feel as you go.

Click here for more information.

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: