Newton Sir Isaac S

Offering intelligent control, the Sir Isaac stability guidance trainer is designed for runners of all levels, including beginners, who are committed to Natural Running and need medial posting for mild pronation. Whether you follow Chi, Pose, Evolution, barefoot running or just want to run better, the Sir Isaac S allows you to run naturally — with greater efficiency and less overuse injuries (like achilles tendonitis and plantar fasciitis). Recommended for any distance and general fitness, walking or working out in the gym.

The Guidance Trainer vs. Performance Trainer? The Guidance Trainer has:

• Beveled Heel and Toe: guides footstrike easily into the midfoot/forefoot
• Beveled Lugs: feels smoother, more stable and gradual in the forefoot
• Wider midfoot/forefoot and lugs: added stability, creating a soft feel
• Midfoot Chassis/Shank: added support and stability
• Carbon Rubber Outersole: increased durability
• Closed Mesh on Upper: keeps small debris out

For new customers, our shoes tend to fit smaller that many common running shoes. With every shoe there is an adjustment period.

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

MIDSOLE

• Single-density, high rebound EVA
• Second generation Action/Reaction Technology™ forefoot and heel
• Midfoot 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

OUTERSOLE

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

GREEN FEATURES

• 100% recycled laces, webbing, insole top cover
• 100% recycled PET upper mesh
• 100% recycled box, packaging
• 10% recycled outersole rubber 

Colour: White/red

Weight: 10.9 ounces (size 9)