The ZX 8000 is the first in the Originals family to feature energy-returning boost technology, resulting in a contemporary redesign. Introducing the ZX 8000 Boost. Two-way stretch mesh and/or suede upper with leather or nubuck overlays and welded 3-Stripes. Integrated boost sockliner for insane comfort. Compression-molded EVA outsole and transparent TPU heel counter for traction and durability.