AWE&reg; AWESpeed&trade; In Mould Adult Road Racing Cycling Helmet 58-61cm White/Red HELMET SIZE: 58-61cm(22.83-24.01Inches). A Unisize Adjustment Headlock System At The Rear Of The Helmet Allows You To Make The Helmet The Perfect Fit Yourself. This Is Also On A Adjustable Slider that Slides Up And Down For Finding The Most Comfortable Fit. Side Straps Will Increase/Decrease The Size To Your Liking VENTILATION: There Are An Amazing 32 Air Vents for maximum cooling (Including 8 Rear). Front Mesh Is Attached To The Front Vents For Prevention Of Bee And Wasp Stings MATERIAL: Its In-Mould Construction fuses the Polycarbonate Outer Shell With The Helmets Absorbing EPS Foam Inner Core, giving an exceptionally Lightweight and Strong Helmet. Dual-density EPS liner. LIGHTWEIGHT: Incredible lightweight material = 266g Making This Hardly Noticeable Whilst Cycling TESTING APPROVAL: The Helmet Is tested for CPSC 5+ year old safety standard certification (CPSC 16 CFR 1203) for bicycle helmets for persons age 5 and older. TUV Tested and conforms to CE EN 1078 standards