Smith's Original Cycling Forefront Helmet. It's construction has Smith's innovative materials which includes their Aerocore "honeycomb" like liner which includes plenty of ventilation with it's 21 vents. Slick design and remarkably comfortable, ample padding and an easy to operate Vaper Fit Retention which you can adjust during your ride. The circumference of my head at mid forehead level is about 22 1/2". The fit adjustment is convenient and ample to allow a hat or beanie under it. It also has an x-static anti- microbial odor control lining. It has real carbon fiber to reinforce key areas called Koroyd which absorbs 50% more impact than a conventional helmet liner and very good coverage. I bought this "top of the line" helmet 5 yrs ago. After only wearing a few times, I bought a more feminine version - the Smith (Rover) helmet which became my go to. Consequently, the helmet is in great condition with no defects. It weighs approximately 300 gms with it's removable visor. I kept it stored it in a very, cool dry area of my house so there should be quite a few more years of safe use. I have washed the padding and thoroughly disinfected the entire helmet. It's a great deal! Storage drawstring bag included. I also have the same helmet, same specs, in green.