The Bern Macon helmet's ThinShell is a tried-and-true technology. It is the ultimate balance between hard ABS or polycarbonate shell thickness and interior EPS foam thickness. With this technology, Bern helmets prove to be safe, durable and strong. The Macon is equipt with a drop-in audio ready liner. The Macon is an all-season helmet perfect for activities in the winter and summer. Summer liners are available for purchase separately.