Running technology term of the day: EVA

If you’re anything like me, you’ve done your running shoes homework, but might not know everything. Once in a while, you’ll run into a whopper of a sentence such as the following:

The Grid Hurricane 8 offers a Dual Density Impulse™ EVA midsole to provide increased shock attenuation with responsive cushioning, while a medial MCD (Motion Control Device) works with the Impulse EVA to slow the rate of pronation.

What the heck does this mean?? Usually, you may end your search here, but fear not, loyal readers, I have the solution for you. After a little homework (I try to go the “extra mile” for the curious), I found an easy-to-explain definition of EVA on

EVA stands for Ethylene Vinyl Acetate. The main constituencies being Ethylene and Vinyl Acetate. By combining these two substances at different ratios produces a wide range of results…used in shoes and boots is a lightweight open-celled foam substance and primarily used for the mid-sole and /or inner cushioning. This form of EVA is both light, durable and tough wearing – an ideal addition to a shoe or boot.

Eureka! EVA is rubbery substance in the middle of the shoe that helps give you a little bounce as you run.

As I come across these hard-to-define words, I’ll continue to add them to this website. Keep your eye out for more technology explained!

February 9, 2006. Sneakers.