adidas X Parley hiking shoes with a sustainable and lightweight design that provides comfort to help you push further and hike longer distances. The Free Hiker is made with Parley Ocean Plastic, which is upcycled plastic intercepted on beaches and coastal communities to prevent it from polluting the oceans. The snug, sock-like upper has a lace-up fastening to support your feet on the trails and a Boost midsole offers responsive cushioning.Upper: Primeblue Yarn/Textile. Midsole: Boost. Sole: Continental™ Rubber.