Take the compact design of the award winning Genesis helmet and integrate a LifeBEAM sensor within the existing head band to monitor your pulse rate and calories burntThe sensor communicates with a processing unit built into the back of the helmet that can then transmit data to most modern communication devices with ANT+ or Bluetooth Removing the need for a chest strap and building it into the helmet you would wear anywayThis ever popular helmet also has all the top features and great venting of a pro helmetRollsys is Lazer's very own award winning fit system: simply control the size and the comfort by turning the wheel on the top of the helmetThe Rollsys system permits an accurate and progressive peripheral sizing adjustmentThe fit of the helmet will be symmetrically tightened up without any pressure points on the head, with a simple one-handed adjustmentBy taking away the retention system at the back the Rollsys system is also the perfect solution for people with a ponytailA small light can also be purchased separately to add you your Rollsys to increase your visibilityAeroshells can also be bough separately19 cooling ventsWeight: 280 g for a size mediumSize: Medium 52-58 cm, Large 58-61 cm