Listen to Coach Stone on Coach Stone Podcast as he interviews Greg Czerpak of 2nd Skull.  

From the website:  2nd Skull products are scientifically engineered to reduce impact. Every 2nd Skull comes with a thin layer of lightweight XRD®, an extreme impact protection material made from special urethane molecules that are soft and flexible at rest but can momentarily harden under sudden pressure.

Visit 2nd Skull at www.2ndskull.com