For months, a roster of Nike All Conditions Gear trail runners has been making its mark across the world’s toughest mountain courses, climbing onto podiums while wearing a completely unannounced prototype footwear model. Every steep ascent, technical descent and tiring mile became a research lab at high altitude, feeding live trail insights back into the development process before the rest of us got a look in. “It felt less like testing a product and more like building something together,” says athlete Gregory of the experience. “They [ACG Kigerfly] make running feel fun and have become the shoe I reach for. The All Conditions Racing Department will continue racing in the Kigerfly, with more podium appearances expected around the world.