K2 Phase Pro Helmet - Men's: Spin in the perfect fit with the K2 Phase helmet. Subtle contouring and perfectly placed passive venting combine for an under-the-radar functional fit. And toss in Baseline Audio System to keep the beats building day-in and day-out. K2DIALED(TM) FIT SYSTEM: The K2Dialed(TM) Fit System creates a custom-fitting helmet no matter what your head shape is. An ergonomically inspired three-point adjustable interface maximizes fit and customization with the twist of a dial. This allows for the ultimate convenience of being able to make fit adjustments on the fly. BASELINE AUDIO SYSTEMS: Pre-installed audio kit with a low-profile speaker that easily connects to your mobile device without hindering the fit or comfort. The on-cord controller is designed for on-the-go usability at your fingertips for talk or tunes. HARD SHELL CONSTRUCTION: Hard-Shell helmets are built to last and will look good no matter how many trips they make in and out of your gear bag. Hard-Shell helmets protect you from impact thanks to lightweight EPS foam bonded to an injection molded and durable ABS shell. FULL WRAP LINER: A comfortable, washable, full-coverage, breathable liner design that wicks away moisture to prevent overheating and seamlessly integrates fit and audio systems. ACTIVE MATRIX VENTING: Climate control at the flip of a switch, Active Matrix Venting allows you to regulate the airflow of the helmet vent system with the push of a finger.