Giro Discord Snow Helmet Construction - soft shell construction, dual density vinyl nitrile (VN) liner Fit system - Auto Loc 2 Fit System - on-the-fly vertical tuning Ventilation - super cool vents with thermostat control, stack ventilation Compliance - CE EN1077 Features - removable goggle retainer, compatible with aftermarket Giro audio systems, seamless compatibility with Giro goggles