Womens Newton Running Energy NR Synthetic Importado Shaft measures approximately Low-Top" from arch Action/ReactionTM Technology in the Midfoot and Heel - Absorbs impact and adds responsiveness through the patented dynamic movement system. Bio-Mechanical Metatarsal Sensor Plate - Allows you to better sense the ground underneath your feet for an enhanced run. P.O.P 1 Platform - A system of lugs that move when pressure is applied, activating the trampoline membrane of the shoe for enhanced efficiency. Semi-Flat Lightweight Laces - For a secure fit. Enhanced Medial Midsole Platform - For greater efficiency.