The primary and collar meshes in the breathable upper are made from recycled nylon yarn, while the tongue mesh includes recycled materials too. The shoes’ lacing system is made from recycled poly – meaning no new plastic is used in their construction. Hoka One One has given the Challenger ATR 6 a light yet stable midsole, made from compression-moulded EVA foam that absorbs impact and provides a comfortable footing. Zonal rubber placement on the outsole provides durability without adding bulk. The Hoka One One Men’s Challenger ATR 6 Trail Shoes are designed to provide a smooth transition from one surface to another, with broad, closely spaced zonal lugs on the outsole. The breathable mesh upper is made from recycled nylon yarn, and the tongue mesh includes recycled materials. The lacing system is made from recycled poly, and the midsole is made from compression-moulded EVA foam that absorbs impact. Zonal rubber placement on the outsole provides durability without adding bulk.