HOKA ONE ONE Challenger ATR 6 Mens Trail Running Shoes Designed for the rougher surfaces you may encounter on your trail runs, the HOKA ONE ONE Challenger ATR 6 Men's Trail Running Shoes are made using a Unifi REPREVE recycled yarn. Further recycled material is used on the poly laces and the mesh of the tongue. This tongue is gusseted to improve comfort and has been paired with a CMEVA foam midsole to stabilise the foot and absorb impacts. The toe rand adds support and protects the foot, while the use of zonal rubber sheds weight and enhances durability. All-terrain traction is made possible with the four-millimetre lugs keeping you sure-footed even on the loosest of surfaces.