Reebok Zig Pulse Mens Shoes-Yellow/Black/Red works via the unique geometry of the zig zag shape which transfers energy back to the actual running stride. Reebok ZigTech?is a uniquely formed zig-zag shaped foam bottom unit designed to make the athlete more fuel efficient so they can do more with less effort- 'Go Longer'.Its unique shape is based on acoustic foam sound absorption technology and absorbs energy at multiple angles. The movement of each node (or 'Zig') is independent, yet connected to the nodes around it. It is designed to absorb energy on impact and reduce vibration creating a soft, quieter, more efficient ride that requires less muscle activation.At heel strike the 'zig's' both shear and compress, absorbing energy and minimizing energy-draining vibration. That energy is stored and returned to the athlete in a quiet, smooth, spring-like effect.People who love this item would also buy Reebok EasyTone Go Outside Women's Shoes Silver/Green.