
Lady Isaac Details

specifications
- Weight (oz): 9.1
- Drop: 3
- Support: Stability

upper
- Light and Airy
- Durable, Comfortable and Breathable
- Performance Lace and Tongue System
- Metatarsal Stretch Panel
- Foot-hugging supportive overlays

sole technology
- Responsive and Agile
- Full-Foot Newtonium Cushioning
- Tactical Flex Grooves to Mirror Foot Motion
- Tuned Posting to Enhance Stability
What Makes Newton Unique?

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.

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.

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.
What Our Runners Think
After I ordered my last pair of Newtons. I haven’t wore anything else. I love them.
As a 50-something year old female who's ankles supinate, the Lady Isaac S is literally one of the only pairs of running shoes I can wear. I discovered them 8 years ago and have not worn another brand or model since. Thank you, Newton!
Very comfortable so far. Had to go a full size up for a good fit but happy
Great support..very comfortable. Thank u
My go-to Newtons for many years have been women’s Fate, but I switched to the Lady Isaac to accommodate recovery from a traumatic foot injury. The Lady Isaac provides a little extra room in the toe box and more stability for my foot as it recovers. Although a tad heavier and heftier than the Fate, the Lady Isaac is what I need right now and I’m happy to be able to stay with Newton!
You Might Also Like…
Here are a few of our favorites from the shop that you might like
After I ordered my last pair of Newtons. I haven’t wore anything else. I love them.
As a 50-something year old female who's ankles supinate, the Lady Isaac S is literally one of the only pairs of running shoes I can wear. I discovered them 8 years ago and have not worn another brand or model since. Thank you, Newton!
Very comfortable so far. Had to go a full size up for a good fit but happy
Great support..very comfortable. Thank u
My go-to Newtons for many years have been women’s Fate, but I switched to the Lady Isaac to accommodate recovery from a traumatic foot injury. The Lady Isaac provides a little extra room in the toe box and more stability for my foot as it recovers. Although a tad heavier and heftier than the Fate, the Lady Isaac is what I need right now and I’m happy to be able to stay with Newton!