The tongue and upper are also updated, incorporating recycled materials and a secure, comfortable fit. Whether you’re seeking support on an off-road run or a shoe to take you from the gym to the street, the Challenger ATR 6 offers breathable comfort and a smooth, stable ride.The Hoka One One Men’s Challenger ATR 6 Trail Shoes are versatile, all-terrain shoes that are light on the trail and smooth on the street. Their midsole geometry and outsole construction provide dynamic traction and a zonal grip for a secure, comfortable fit. The upper is made with recycled materials for breathable comfort, and the tongue includes recycled material for a smooth, stable ride.