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SELECTING A SHOE SIZE

Order your Newton shoes based on your current running shoe size. If you are deciding between half sizes or if your current running shoes are snug, we recommend going up a half size. The foot needs room to work naturally inside of the shoe, so it is important to have a half to a full thumb's width in front of your toes. If you do not have this in your current running shoes, we recommend choosing a half size larger.

If the shoes are too small, you will not be centered over the forefoot technology and the cushioning, levering and propulsion of the shoe will not be fully optimized. The perfect fit should always accommodate the larger foot if you have one foot slightly larger than the other.

Standard Newton Running shoes can fit width sizes up to a D. The Isaac Neutral Guidance Trainer (Wide) will accommodate widths of DD or greater. Women with a very wide foot may want to try the men's shoe in a 1.5 size smaller.

The following sizing charts are provided to help you select your appropriate size and to convert between different sizing models.

Men's Shoe Sizing Chart

US EURO UK CM
6 38.5 5 24
6.5 39 5.5 24.5
7 39.5 6 25
7.5 40 6.5 25.5
8 41 7 26
8.5 41.5 7.5 26.5
9 42 8 27
9.5 42.5 8.5 27.5
10 43 9 28
10.5 44 9.5 28.5
11 44.5 10 29
11.5 45 10.5 29.5
12 46 11 30
12.5 46.5 11.5 30.5
13 47 12 31
14 48 12.5 32
15 49 13 33

Women's Shoe Sizing Chart

US EURO UK CM
5 35.5 3 22.5
5.5 36 3.5 23
6 37 4 23.5
6.5 37.5 4.5 24
7 38 5 24.5
7.5 38.5 5.5 25
8 39 6 25.5
8.5 39.5 6.5 26
9 40 7 26.5
9.5 41 7.5 27
10 41.5 8 27.5
10.5 42 8.5 28
11 42.5 9 28.5
11.5 43 9.5 29
12 43.5 10 29.5

If you find that your shoes don't fit perfectly, we will gladly pay shipping costs for exchanges in the US (sorry, we are not able to pay for international shipping exchanges at this time). Just let us know and will send you the new pair.

If you are still not certain, call us at (877) 860-7695 to talk to a running specialist.

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  • Just wanted to say that I LOVE your shoes, and I'm probably not going to be able to comfortably run in another pair of shoes after becoming accustomed to the Newton design...
    — Rob M.

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