Sir and Lady Isaac Product Details

We’ve had some recent requests to post information on the new Sir and Lady Isaac shoes that are now available on Newton Running.



The Sir and Lady Isaac’s intelligent control is great for all foot types. The Isaac is a neutral guidance trainer designed for runners committed to improving their running form to the more efficient midfoot/forefoot running style.


  • Highly breathable, fast-drying, closed mesh
  • Slip-proof laces with heel-securing double eyelets
  • Lightweight ergonomic support strapping
  • Metatarsal stretch panels
  • Reflective logo and heel tab


  • Single-density, high rebound EVA that stabilizes all foot types
  • Second generation Action/Reaction Technology™ forefoot and heel
  • Midfoot/rearfoot support chassis for added stability
  • Beveled heel and toe
  • Met-flex enhanced forefoot flexibility
  • Enhanced sock-liner that increases energy return and protection
  • Accommodates orthotics


  • Second generation durable, high traction actuator lugs
  • Increased toe spring
  • Pronounced heel rocker
  • High-wear carbon rubber with traction tread

Get your Lady Isaac S or Sir Isaac S shoes today!