Giro Jackson MIPS Helmet - Men's: Down the Line Style The new Jackson(TM) helmet is first focused on design and style. The sleek new standout helmet lines created an opportunity for an evolutionary step forward in new performance and functional attributes. The modern profile of the new Jackson helmet utilizes the new Passive Aggressive Venting system, inspired by the aerodynamic airflow of high-end autos. The discreet, yet powerful system effectively manages airflow and temperature while in-motion riding, hiking or standing static. The overall look is finished with a slight brim and subtle lines for Seamless Compatibility with Giro goggles. The new Jackson and Terra feature MIPS technology, an ultra-lightweight construction and the dialed In-Form 2 Fit system allowing riders to confidently focus on the terrain ahead. Leave no line untracked in the new ultimate freeride helmet. CONSTRUCTION: MIPSA(R) - Multi-Directional Impact Protection System In-Mold construction FIT SYSTEM: In Form(TM)2 Fit System On-the-fly vertical tuning VENTILATION: Passive Aggressive venting system Stack Ventilation FEATURES: TPU injected brim Removable goggle retainer Removable earpads Compatible with aftermarket Giro audio systems by Outdoor Tech Seamless Compatibility with all Giro goggles Compliance: CE EN1077 SIZES: S 52-55.5cm M 55.5-59cm L 59-62.5cm XL 62.5-65cm (in select colorways)