The Giro Trig MIPS is a perfect helmet for progressive riders looking for freestyle comfort, protection and style on the mountain. The In-Form™ Fit System uses a dial to get that perfect fit and removable ear pads and goggle retainer help you customize your look and comfort levels. Giro\'s Thermostat Control allows you to regulate the airflow through the helmet to prevent overheating and help you always keep a cool head when you are lining up a big kicker. The Giro Trig Helmet also features MIPS (Multi-Directional Impact Protection System) which has a low-friction inner shell that rotates upon impact to absorb the energy and not transfer it onto your head lowering your chance of injury.Giro Trig MIPS Helmet Features: Hard Shell Construction MIPS Equipped In-Form™ 2 Fit System Vertical Tuning Thermostat Control™ Adjustable Venting Stack Ventilation Removable Goggle Retainer Removable Earpads Compatible with Giro Audio Systems Seamless Compatibility with all Giro Goggles CE EN1077 Certification S 52cm – 55.5cm, M 55.5cm – 59cm, L 59cm – 62.5cm