How does it work? The makers of the goo, a company called Tech 21, elaborate on their website:
"It's all about the molecules inside the revolutionary D3O® Impact Material. In everyday use, the molecules flow freely, but upon shock or impact they lock together - absorbing the impact force and spreading the shock evenly across the surface of the material. That means your device stays in one piece, no matter how hard the impact!
What makes Impactology™ unique is the secret ingredient D3O® Impact Material used within our designs. It's composed of a non-Newtonian polymer with an intelligent molecular structure. So clever in fact, that it has been adopted worldwide by the military for its power in impact protection on the battlefield."
Pretty cool stuff!