The Nike Air Cesium 2 is a super light and stable running shoe that works without a medial post. Breathable sandwich mesh upper with improved lacing system for a better fit. Medial support overlays. Soft crash pad helps control overpronation. Zoom Air™ unit in the heel. Internal geometry's mimic orthotic design. WARP Tech in forefoot. Duralon™ adds extra cushioning. BRS 1000™ provides added longevity. Wt. 8.1 oz.