Description:The newest addition to the Newton family offers intelligent control 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. How does the Guidance Trainer differ from the Performance Trainer? * Beveled Heel and Toe: helps guide runner easily into the midfoot/forefoot * Beveled Lugs: smoother, stable feel that is more gradual in the forefoot * Wider midfoot/forefoot and lugs: adds stability and creates a softer feel * Midfoot Chassis/Shank: adds support and stability * Carbon Rubber Outersole: increases durability * Closed Mesh on Upper: keeps small debris out UPPER * 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 MIDSOLE * 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 OUTERSOLE * Second generation durable, high traction actuator lugs * Increased toe spring * Pronounced heel rocker * High-wear carbon rubber with traction tread