Light, breathable synthetic upper with PU overlays in high abrasion areas for added protection & durability. Pull loops on heel & tongue for easy on/off. Anti-fatigue, molded Contoura® Support footbeds with shock-absorbing foam. Full-length Charged Cushioning® midsole for the ultimate in lightweight, shock-absorbing comfort​. Durable Vibram XS Trek outsole is responsive on unpredictable terrain with great flexibility & wet traction.