When you've got the Lazer Oasiz helmet on your head, be assured that it's got your back no matter where you happen to be riding in the outdoors. This helmet, the winner of the 2011 Eurobike Award, is packed full of features and technology. It has the Rollsys (R) Retention System with Adjustable Head Basket for an easy to adjust and perfect fit. On the inside it has the Rigidity Brace System for lightweight performance while still offering superior resistance again multiple impact crashes. It features Coolmax padding and 21 vents to ensure the helmet interior stays cool and comfortable. The clever Multimount system allows for the direct installation of a GoPro camera or headlight mounting adapter onto the top. The Oasiz helmet can also, optionally, be outfitted with an insect net or winter padding so you can ride in whatever the weather happens to throw your way. Lazer Oasiz Helmet Specifications: Gender/Age: UnisexDOT Certified: NoMIPS: NoCertifications: CE - CPSC - ASMulti Impact: NoVisor included: YesWeight: 330 grams (medium) , 360 grams (large) Size Chart Helmet Size Medium Large Head Circumference (IN) 21.7 - 23.2"" 22.8 - 24""