Introducing the eco-friendly Zelen: comfort and sustainability come together in this zero-drop, minimalist road running shoe made with biodegradable and recycled materials. It features a breathable knit upper made with rPET recycled material and a silky-smooth, biodegradable sock liner to keep you cool and comfortable mile after mile. The flexible yet durable 5.0 mm FeelTrue® sole features a tire-inspired tread to give you confident grip and control on asphalt, cement, and pavement – all without sacrificing the ground feel and feedback you love from Xero Shoes.