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.
 
Engineered mesh upper is extremely lightweight & breathable, with strategic support where you need it
Foam padding placed around your ankle collar & under the tongue for an incredibly comfortable fit & feel
Comfort sockliner molds to your foot with padding in the heel for ultimate cushioning at heel-strike
Charged Cushioning® midsole uses compression molded foam for ultimate responsiveness & durability
Tire inspired outsole pattern provides ultimate flex & superior traction