Offering intelligent control, the Sir Isaac neutral guidance trainer is designed for runners of all levels who are committed to Natural Running. Whether you follow Chi, Pose, Evolution, barefoot running or just want to run better, the Sir Isaac 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.

• 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

• Single-density, high rebound EVA
• 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

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