From snow to biking, stay protected in style with the Bern Diablo EPS helmet! ; Designed for tweeners, not quick small enough for a kids helmet and not quite big enough for the adult models. ; A thin ABS shell lined with EPS hard foam to create a burly lightweight All Season lid. ; All Season top pade rotates to funtional as a vent cover in cold weather. Removable cordova earpads for warm weather conversion. ; Top and back vents provide a balance of airflow and style. ; Adjustable snap buckle chin strap for a custom fit. ; Bern's trademark Sink Fit design creates a low-profile style that combines with a deep surround fit and feel. ; EPS hard foam meets ASTM F 2040 and EN 1077B standards for snow and ski, CPSC and EN 1078 standards for bike and skate. ; Imported. Measurements: ; Circumference: 21 in ; Product measurements were taken using size MD/LG (55.5-59 CM Circumference). Please note that measurements may vary by size. ; This product may have a manufacturer's warranty. Please visit the manufacturer's website or contact us at for full manufacturer warranty details.