Newton Running Men's Distance IV Synthetic-and-mesh P.O.P.1 Platform - Lightweight and power packed, designed with open chamber Action/Reaction technology with more isolated and rigid lugs for greater responsiveness. Action/Reaction technology in Midfoot - Newton's patented active trampoline-like technology reduces energy loss. Anatomical Metatarsal Stretch Panels - Upper that moves with your foot for a more comfortable and natural feel. High-rebound EVA - Offers energy returning properties as well as dissipating shock. s.h.a.r.c Outsole - Super High Abrasion Rubber Compound is placed in high wear areas to add durability to the shoe.