The K2 Phase Pro helmet for men offers a low profile, hard-shell design and clean style that provide safety and comfort The comfort is enhanced with the combination of the Active Matrix Ventilation and the perfect fit of the K2dialed™ Fit System. The integrated K2 Baseline Audio System lets you call your boss on a \"sick day\" and keeps your music flowing too. Construction A hard-shell construction made of a solid ABS shell and EPS foam inside offer protection even with a hard crash. Ventilation Active Matrix Venting allows you to regulate the airflow of the helmet vent system with the touch of your finger. Controlling large vents with minimal effort results in superior style and function that can be adjusted on the fly. Climate control with the flip of a switch. Fit System The K2Dialed™ 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 feature allows for the ultimate convenience of being able to make fit adjustments on the fly. Baseline Audio System The removable K2 Baseline Audio system seamlessly connects the new Level 3 Speakers with your cell phone or media player. The audio system comes pre-installed in Baseline Audio Earpads. The speaker housing creates a minimal, low-profile stowage, so you won\'t notice the speakers unless the music is playing. With a detachable cord and an all-new on-cord audio controller for initiating on-the-go pause/play and answer/hang-up functions, your media device is literally at your fingertips. FeaturesMen\'s helmet by K2 washable full-wrap liner systemK2dialed™ fit systemBaseline Audio SystemWeight: 490gCertification: ASTM F2040, EN1077: 2007 Class B