Whether you are tackling the toughest terrain, the desert, or even the busiest city streets, the Nike ACG Mountain Fly 2 is your best bet. The grippy rubber outsole offers traction inspired by rock spikes, while the soft React foam midsole provides the ultimate comfort. The breathable upper allows air to circulate and moisture to evaporate quickly. The semi-reinforced tongue and lace blocker allow you to put the shoe on and adjust it quickly on the go.