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Men's Sir Isaac S

5.0 12

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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 • 11.6
  • 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

  • No animal products were used in the making of this shoe


  • 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

The Newton Secret Formula
Action/Reaction Technology

The secret formula powering the speed of Newton Running shoes is its proprietary Action/Reaction Technology. Generated by the active movement of the lugs, it creates a responsive, trampoline-like cushioning system that provides quicker bounce-back and loses less energy than a traditional foam-core running shoe.

Level Platform

Over time, many shoe designs have become thicker, softer and heavier with greater heel heights. In the spirit of making every stride better, Newton shoes feature lower heel to toe drops to put you in a more natural running position.

Full Foot Cushioning

If you love the responsive yet cushioned feel of the lugs in the forefoot, you'll be happy to find out the same technology exists in the heel. With Newton Running, you get full-foot cushioning and protection.

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12 Customer Reviews

Good overall shoe
This is my second pair of Newton’s, and I am a lifetime customer for sure. About 200 miles on these shoes and zero complaints for comfort. One thing to note is that I had to go up half a size from my previous shoes to account for the extra support that felt a little tight over the top of my foot. Overall a fantastic shoe!
August 4, 2018
I will never wear anything else!
I am now on my 5th pair of these incredible shoes. I am not a runner, but I work in the medical field and am on my feet for an inordinately long time each day. These shoes are the most comfortable, most supportive of anything on the market. If they ever stop making these, I will just be lost.
July 12, 2018
Best running shoe ever!
This is a great shoe. When I heard you were stopping it, I bought all that I could, and I am so delighted you have brought it back.
Best shoe ever.
May 2, 2018
Please bring this back on neutral
I wear tested for Newton in 2011 and the first pair I got was the original Sit Issac. To this day, it was my favorite shoe of all time. Please, please Newton bring this shoe back.
March 27, 2018
No More Shin Splints
Went thru two other brands of shoes when i began running and experienced shin splints and aching knees I've been using these for 10 months now and my pain is but gone. great shoe.
December 7, 2017
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