Genesis, the lightest helmet Lazer has ever made, resets the bar for top level performance cycling. So light you will forget it’s on your head! Featuring a superlight version of their Advanced Rollsys System and Adjustable Head Basket creating an easy to adjust and always perfect fit. Fully vented for maximum cooling. Race or Comfort padding sets included to shave grams or increase comfort. With the integration of the MIPS layer, the Genesis MIPS also has an additional protection aspect against rotational impacts. Features Lightweight - The lightest Lazer helmet ever. Well Ventilated - To keep you cool and comfortable for longer rides. Advanced Rollsys System Ponytail-friendly top mounted fit system for easy horizontal and vertical adjustment. Comes with Race and Comfort Pads - Shave grams or increase comfort with two padding options Lazer Aeroshell Compatible - Upgrade for increased aerodynamic protection, and complete protection from the elements. UCI World Tour Helmet - Developed in partnership with multiple UCI WorldTour Teams. MIPS layer - Provides increased protection against rotational impact. Specifications Fit System Construction Ventilation Weight Certification Advanced Rollsys System In-Mold 22 vents 260g (Small), 280g (Medium), 290g (Large) CE-CPSC-AS Size Guide Small Medium Large 52-56CM 55-59CM 58-61CM