TROY LEE DESIGNS A2 MIPS SUPERSTARWearing a helmet while you're riding is essential to staying safe. Crashes can happen at any speed and can happen at any time, so you should always be prepared. You can now be a superstar while you ride with the A2 Superstar MIPS Helmet by Troy Lee Designs. It combines both EPP and EPS for both low-speed and high-speed impacts. It features a Multi-Directional Impact Protection System that helps protect your head from angled impacts that cause rotational energy. The A2 features 25% larger intake vents than the A1 and has an updated X-Static Pure Silver Comfort Liner that provides moisture wicking and odor protection. The A2 comes with an expanded field of view that works with both glasses and goggles and has adjustable strap dividers so you can get the perfect fit.FeaturesMIPS protection to help protect from angled impactsEPS co-molded with EPP for low and high-speed impact protectionComes with a ventilated helmet storage bag and sticker kitLightweight at only 350 grams for a M/L sizeSizingHelmet SizeExtra Smal/SmallMedium/LargeExtra Large/XX LargeHead Circumference (in)21.3-2222.4-23.222.6-24.8Head Circumference (cm)54-5557-5960-62Hat Size6 3/4-77 1/8-7 3/87 1/2-7/8How to Measure To find your perfect fit, measure the circumference of your head just above your ears and eyebrows using a cloth tape measure or a piece of string and a ruler. Use the chart above to determine the proper helmet size for you.