Unique comfort; Responsive, soft, performance-focused design; Durable Vibram XS DURA rubber outsole, 8.5% grippier than Torin?8; P35X dual-density foam combining soft and firmer foam for energetic, cushioned, stable ride; Updated heel shape; Elevated tongue details; Breathable mesh upper for improved fit and soft step-in; Altra Fit provides ample room for toe freedom; Secure midfoot support; Zero drop for natural movement