Zero Distractions Multilayer breathable fabric in the upper is lightweight and dimensional with a broken-in feel. Added thickness in strategic areas helps keep your feet in place by reducing small movements inside the shoes. Responsive Sensation The full-length Zoom Air Strobel unit is stitched directly to the upper. It helps cut unnecessary weight and provides full-foot responsiveness. Cushlon foam adds a soft feel. Tuned Traction Grooves and ridges in the sole give you multidirectional traction, while a stiff piece under the arch helps keep the shoes stable. Both shoes together reveal the face of a skull. Hook-and-loop strap wraps over the top of the laces for support. Stiff piece on the outer edge provides midfoot stability.