Light and flexible is the name of the game here. A lot of mesh for breathability and Charged Cushioning to help protect against impact. Just put them on and run for miles.

Lightweight mesh upper delivers complete breathability
Foam padding placed around your ankle collar & under the tongue for an incredibly comfortable fit & feel
Dual density Charged Cushioning midsole for the ultimate blend of comfort & explosive energy return
Tire inspired outsole pattern provides ultimate flex & superior traction