On Cloudboom Strike Men's Shoe Gifts Use the 120 decibel fold-out

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

Six-spike pin configuration

Mesh: 82% polyester/18% spandex

A full-length short liner provides extra coverage and support

Interchangeable R8-Inserts for customization

On Cloudboom Strike Men's Shoe Gifts Use the 120 decibel fold-outNeutral & 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