IDC's new "skin-on-bone"-mimicking motorcycle helmet - Core77: "Traditionally, motorcycle helmets have been rigid in design. We needed to introduce a dynamic element of movement to dramatically reduce the rotational impact which often causes life-threatening injuries. On impact, the outer membrane is able to stretch and slide over the main helmet shell to prevent these dangerous rotational forces being transmitted to the head and brain.
...The revolutionary product design required careful selection of materials. A strong synthetic sits on top of the gel-like lubricant to form a protective layer across the surface of the helmet. State-of -the-art vacuum casting was used to create prototypes and the materials tested for resistance and strength. The chosen synthetic stretched up to eight times its original length."