Fox Racing Transition Hardshell Bike BMX MTB Helmet (Burgundy Medium) SAFETY - The EPS core absorbs any hits or bumps, while the ABS exterior is sturdy and durable. Cpsc 1203, ASTM f1952, astm63:2008, en078:1997 approved. STYLE - The rounded silhouette is reminiscent of old school skate helmets, and the wide variety of colors and Fox branding give it a little bit of street cred. COMFORT - The Transition Hardshell features 12 optimized vents to keep you cool, while the inner microfiber comfort liner prevents chafing. Plus, the comfort liner is removable and washable. USE - Wear it everywhere- during leisurely park rides, long days dirt jumping, or even on hard, adrenaline filled trail rides; this helmet can stand up to whatever you throw at it. Life is short, go wild. DIMENSIONS: Available in sizes Small (20.5 in. - 21.25 in), Medium (21.67 in. - 23.125 in.), and Large (23.25 in. - 24 in). Runs small, sizing up is recommended.