Constructed of an earlier model that has been stripped down to the core, the The Adidas ZX Flux has a personality of its own. While this retro runner has been compared to the likes of the Y-3 Qasa, ZX Flux, and even the SL Loop Runner, the designer and adidas VP of Global Design, Nic Galway, has crafted a casual, street-ready model that's in a category of its own.