Here is a helmet that uses 2 foam liners instead of 1 foam liner in most helmets today ... http://motocrossactionmag.com/Main/News/6D-ATR1-HELMET-IS-THIS-THE-BREAKTHROUGH-IN-HELMET-9570.aspx
wow! It's cheap too! (not) I'm just gonna get a helmet for my helmet... Better yet I'll try driving a car. It's like a helmet you can get inside and cruise around in.