Sport Direct&trade; The Hand&trade; BMX Helmet Green 55-58cm US CPSC 16 CFR 1203 Safety Standards Tested HELMET SIZE: 55-58cm(21.65-22.83Inches). A Unisize Adjustment Headlock System At The Rear Of The Helmet Allows You To Make The Helmet The Perfect Fit Yourself. Side Straps Will Increase/Decrease The Size To Your Liking VENTILATION: There Are An Amazing 9 Air Vents for maximum cooling (Including 2 Rear) COMFORT FIT: EPS Foam Lining With Fitting Pads For Maximum Comfort Inside The Helmet. A Padded Chin Strap For Even More Comfort LIGHTWEIGHT: Incredible lightweight material = 435g 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 1078:2012+A1:2012 standards NB: Not Suitable For Downhill Riding / Racing Or For Motor Vehicle Use. Road Bicycle Use ONLY!!