The Sena helmet thread lead me to these on lanesplitter.
Two new helmet designs that both have internal rubber shock absorbers between two shells.
One is from 6D the other is from Bell.
http://lanesplitter.jalopnik.com/6d-has-their-own-brain-saving-street-helmet-on-the-way-1738310550
http://lanesplitter.jalopnik.com/this-new-bell-helmet-is-the-most-important-street-helme-1736843351
Two new helmet designs that both have internal rubber shock absorbers between two shells.
One is from 6D the other is from Bell.
http://lanesplitter.jalopnik.com/6d-has-their-own-brain-saving-street-helmet-on-the-way-1738310550
http://lanesplitter.jalopnik.com/this-new-bell-helmet-is-the-most-important-street-helme-1736843351