661 evo am helmetthe evo all mountain helmet from 661 is a state of the art open face helmet featuring boas built in 360 micro adjustment system this feature allows the helmet to fit every head shape comfort and securitycomfort and security was 661s focus when constructing this helmet with the spotlight on being able to produce a helmet that only needs adjusting once before you start cycling and then forgotten about remarkable comfort661s evo am helmet is able to reach remarkable levels of