Featuring our custom low and snug fit the evolution helmet it the least voluminous hardshell design available and fits to your head like a protective second skinit39s a tough hardshell construction that curves anatomically correct around your head for a great fit and wearing comfortthe evolution is shaped on all four sides of the helmet and fits without slipping or jiggling it is the shape and fit role model for most of our helmetsbut it39s not just all about the great shape as safety