Bell zephyr mips helmetfrom lung searing cyclocross laps to long days filled with steep climbs the bell zephyr mips helmet fits and feels so good that youll forget its there the most innovative road cycling helmet bell has ever created follows years of research analysis and real world testing the result being an uncompromising combination of performance it starts with progressive layering technology a joining of two eps segments that have different densities to help manage impact energies