New in Box and never used Insoles fit minimalist or thick-soled running shoes Nylon/poron/free-flex foam enriched by bamboo charcoal and curEVA Dynamic arch support keeps 100% contact while standing and running Super lightweight to reduce fatigue during long distance runs Forefoot polyurethane rubber improves the energy return during push off Triple-layer design optimizes moisture wicking and reduces blisters Heel poron helps to absorb impact Deep heel cups improve the in-shoe fit Decoupled heels help reduce pronation Zero drop