Cannondale Terrus Helmet Advanced trail-ready protection The Cannondale Terrus is Cannondale's advanced MTB helmet for technical riding, with advanced protection, ventilation, and performance features to take your riding to the next level. The Terrus is constructed using Smart Construction technology, an in-mold process that bonds the outer shell with the inner EPS foam, creating a stronger, lighter, sturdier helmet. The Terrus also boasts MIPS Air Node technology, the lightest MIPS system available, providing additional rotational impact protection without the weight penalty. A magnetic Fidlock closure can be used with one hand, while an Ergo Fit+ Dial and Bio Map Fit create one of the best-fitting MTB helmets on the market. Features Smart Construction uses an in-mold bonding process, bonding the outer polycarbonate shell with the inner EPS liner for a sturdier helmet Built-in accessory mount for more accessory attachment options Fidlock closure uses a quick and secure magnetic system to secure the helmet Intelli Vent Cooling offers incredible cooling airflow at any speed MIPS Air Node eqipped is the lightest MIPS system available, for a reduction of rotational forces caused by certain types of impacts Intelli Vent design features a full-width brow vent with huge central intake vents and seven exhaust vents to direct airflow through the entire helmet Ergo Fit+ Dial provides precise, 360-degree fit adjustment at the turn of a dial SPECIFICATIONSFit system Ergo Fit+ Dial Intended Use Trail Weight370 grams (size S/M)Size Small Medium Large Head Circumference (cm)51cm - 55cm55cm - 59cm59cm - 63cm | Cannondale | Terrus Adult Helmet Men's | Size Small In Starry Night Black