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Lady Isaac S


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The Lady Isaac S is back by popular demand! As our most structured and supportive running shoe, the Lady 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 • W011416
  • Weight • 9.2
  • 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
my favorite running shoes- and I have tried them all
Newton's are my favorite running shoe, I have used every brand from Nike to Hoka One-One; depending on my run; I have bought almost every style of Newton's and the Lady Isaac S is my favorite. Someone asked me the other day "why do you like your Newton's" and I said this .. "you know the feeling you have when you get home at night and you remove an article of clothing or your shoes and say AHHH?" " That same Ahhh is what I say every single time I put on my Newton's" I love them, they make my feet say AHH! My personal time and my love for running have only increased in my Newtons. I have cronic pain as well and when I have my Lady Isaac S running shoes are on; I have little to no painl. I have one pair just for my running; and one pair for every day walking or just hanging around on a weekend! It is worth the minor investment!
September 6, 2016
Troy, MO, US
I run to:
General fitness
Weekly MIleage:
0-20 miles
Love these!
I usually run in the lighter models with less support. But, I wanted to try the Lady Isaacs as a variation for my long marathon-training runs, and for whenever my feet felt as if needing a little more support for pounding down the mileage. They are everything I hoped for. I even use them for tempo runs now.
October 10, 2016
Essex, CT, US
4 months ago
I run to:
Test my limits
Weekly MIleage:
41-50 miles
They're Back!
So glad you brought the Lady Isaac back! I've been running in these sneakers injury free for 4 years now. Even when they were discontinued I found pairs in my size online. The new Lady Isaacs are just like the old ones - perfect!
October 29, 2016
New York, NY, US
2 months ago
I run to:
Maintain my sanity
Weekly MIleage:
41-50 miles
Great Shoe!
I am glad these came back from retirement! They just feel comfortable immediately.
November 15, 2016
Edina, MN, US
I run to:
General fitness
Weekly MIleage:
21-40 miles
Best shoes ever!!
My first Newton was Lady Isaac, and I love it!! But later I started to try differents Newtons, like fate, motion 5, and I forgot the another ones try it because the color but, Lady Isaac they're so comfortable I can run forever and my feet feel great.
November 2, 2016
Allen, TX, US
3 months ago
I run to:
Maintain my sanity
Weekly MIleage:
21-40 miles