661 evo am patrol mips helmet661s evo am patrol mips helmet is the ultimate all mountain open face helmet featuring a built in boa micro adjustment system which enables the helmet to fit every head shape comfort and securitywhen developing this helmet 661 focused on comfort and security with the goal being to deliver a helmet that only needs to be adjusted once when starting your ride and then forgotten about impressive comfortthe padded surface and its 15 vents allow the evo am to reach an