Men's Sir Isaac S


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The Sir Isaac S is back by popular demand! As our most structured and supportive walking shoe or running shoe, the Sir Isaac S is for runners who want stability in a responsive, cushioned ride. Medial posting and midfoot support help to offset pronation.

Product Details

  • Item number • M011316
  • Weight • 11
  • Platform • 4 lug
  • Heel-to-toe drop • 4.5mm
  • EMB • Yes


  • Highly-breathable closed mesh

  • Slip-proof laces with heel-securing double eyelets

  • Lightweight ergonomic support strapping

  • Metatarsal stretch panels for foot adjustment

  • Reflective logo and heel tab


  • Durable high-traction lugs

  • Increased toe spring

  • Pronounced heel rocker

  • High-wear carbon rubber with traction tread


  • High-rebound EVA

  • Action/ReactionTM technology in the midfoot and heel

  • Midfoot support chassis for added stability

  • Medial posting to offset pronation

  • Beveled heel and toe

5.0 / 5.0
5 Reviews
5 Stars
4 Stars
3 Stars
2 Stars
1 Star
Thank You!!!
The return of the Sir Isaac S is the best thing that has happened. Thank you Newton for bringing back the most comfortable running shoe I've ever worn.
November 21, 2016
Tulsa, OK, US
9 months ago
I run to:
Maintain my sanity
Weekly MIleage:
21-40 miles
I don't just like this shoe I love this shoe. If weight isn't an issue (not that it's heavy at all) this is the shoe for you. Very durable.
October 24, 2016
35630, AL, US
10 months ago
I run to:
Crush the competition
Weekly MIleage:
51 miles and up
glad they are back
love the look and feel of this shoe. helps prevent injuries, especially for older runners who have been running for yeard
January 25, 2017
Atlanta, GA, US
8 months ago
I run to:
General fitness
Weekly MIleage:
0-20 miles
Excellent shoe
I was a little hesitant to purchase this shoe because the design was new to me, however I'm really glad I did. I am currently on my 10th pair of Newton's I think. Living in Ottawa Canada winter running can be challengening at best, but these shoes have been great. I am a huge Newton fan for the reason I have had back issues for years, and the design of the Newton has me landing on my forefoot and not my heel. You cannot believe how this type of shoe has changed my enjoyment of running. And they are wicked fast too.
December 30, 2016
Ottawa, ON, CA
7 months ago
I run to:
Test my limits
Weekly MIleage:
21-40 miles
Amazing running shoes
These are my 4th pair of newton running shoes and I won't run in anything else. These just became my new favorites. Took them out of the box went running and felt amazing.
June 4, 2017
Canon City, CO, US
1 month ago
I run to:
General fitness
Weekly MIleage:
0-20 miles