The outsole lugs are broad, closely spaced and deliver a seamless transition from one surface to another. The Challenger ATR 6 also has a breathable mesh upper and a unifi repreve recycled yarn in the primary and collar meshes. For support and protection, it has a toe rand and a gusseted tongue. Plus, the tongue mesh includes recycle material. The shoes CMEVA foam midsole provides stable footing and absorbs impact points. There is also zonal rubber placement for weight savings and durability.