On Cloudboom Strike Men's Shoe Gifts A full-length short liner provides

A full-length short liner provides extra coverage and support

Use the 120 decibel fold-out safety whistle to alert other runners—and mountain lions—of your presence

Interchangeable R8-Inserts for customization

Mesh: 82% polyester/18% spandex

world record holders and the fastest marathoner of all-time

On Cloudboom Strike Men's Shoe Gifts A full-length short liner providesNeutral & Racing High Cushion 4mm Heel Drop Cushioned Bounceboard Made using ultra responsive Helion HF hyper foam, the shoes innovative Bounceboard construction propels you forward with power. A removable layer of plush cushioning, it maximizes energy return for a bouncy feeling underfoot all while abiding by stack height regulations. A cushioned ride, ideal for long races. Carbon fiber Speedboard The stiff, spoon shaped Speedboard works like a