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Sir Isaac S

Stability Core Trainer


The Sir Isaac Stability Guidance Trainer is designed for all runner types. Like all Newton shoes, the Sir Isaac offers highly responsive cushioning and ground feel, with a more level-to-the-ground platform and lighter weight. As our most traditional, structured and supportive running shoe, the Sir Isaac helps you transition into the Newton running experience. The Sir Isaac S has medial posting to offset pronation.

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Product Details

The Sir Isaac S Stability Guidance Trainer accommodates all types of runners. The Sir Isaac S is built on our Guidance Trainer platform, and is a great shoe for someone who is looking to achieve a more natural foot strike. The Sir Isaac S is built on a more level platform and designed with our highly responsive, active cushioning system both in the midfoot and rear foot. The Sir Isaac S offers the perfect combination of support and flexibility, allowing your foot to perform naturally when running or walking.

  • Item number • M011913

  • Weight • 10.9

  • Heel-to-toe drop • 4.5mm

  • Upper

    • 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
  • Outersole

    • Durable high-traction actuator lugs
    • Increased toe spring
    • Pronounced heel rocker
    • High-wear carbon rubber with traction tread
  • Midsole

    • Single-density, high-rebound EVA
    • Second generation Action/ReactionTM technology in the midfoot and heel
    • Updated midfoot support chassis for increased flexibility
    • Beveled heel and toe
    • Met-flex enhanced midfoot flexibility
    • Enhanced sock-liner that increases energy return and protection
    • Accommodates most orthotics
Compare Models
Sir Isaac S

Perfect for people who are transitioning from a heel-strike, who like more support or who run/walk. More on finding your foot type Here.

  • Foot type • Stability
  • A/R Technology • Forefoot & Heel
  • Heel - to - toe drop • 4.5mm
  • Forefoot • 4 Lug Carbon Rubber Technology
  • Heel • Carbon Rubber
Men's Gravity III

Perfect for the runner transitioning to a midfoot strike and is currently using lightweight footwear. More on finding your foot type Here.

  • Foot type • Neutral
  • A/R Technology • Forefoot & Heel
  • Heel - to - toe drop • 3mm
  • Forefoot • 5 Lug P.O.P.1 platform
  • Heel • Super high abrasion rubber compound
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