S1 Helmets is stepping up impact reduction by adding an additional layer of protection to your helmet with our revolutionary new impact reducing sizing liner the RAD Liner.

S1 RAD Liners are an impact reducing sizing liner that Reduce Absorb and Disperse impact energy away from the head when impacted.

RAD liners serve a dual purpose by both acting as your helmets sizing liner while also adding an extra layer of impact reducing foam to your helmet.  Lab Tests show that depending on the impact RAD Liners reduced impact energy an additional 7.5% to 16.5% averaging a 12% energy reduction to the head in all liners tested.

RAD Liners are sized just like our standard sizing Liners and fit into all S1 Lifer Helmets and are covered in a sweat absorbing, hand washable terry cloth fabric.

S1 RAD Liners. Next Level Protection.