VS 

SHOCKtec® Gel and SHOCKtec® Air2Gel products are not like any gel you have seen before... and they are not foams. They are actually hybrid polyurethane elastomers (viscoelastic dry polymers). SHOCKtec® Air2Gel is the only Air-Frothed Elastomer Gel in the world. These unique materials have few, if any equals with respect to impact protection, comfort, durability and shock absorption.