With the hybrid construction, this helmet is compact and will _protect you from lateral, front and rear impacts. Simple pinch adjusters_ at the back ensure a personalised fit, whilst the wide ventilation _holes make it comfortable to wear all-day and still remain comfortable.Impact and scratch resistant hard and durable outer shellHybrid construction - thick ABS shell, EPP foam liner and EPS foam linerSoft headband - conforms to the shape of your head and folds into the shell for storage and transportationDesigned in accordance with Petzl's Top and Side Protection label Head-covering shape, lower in the rear, offers enhanced protectionEPP and EPS foam liners throughout the inner shell - for comfort and stability on the headFour clips for headlamp attachment Optimised head volume - gives extra comfort without adding bulkWide ventilation holes for superior airflowCompatible with the Petzl Vizion eye shieldMaterial(s): ABS shell, expanded polypropylene (EPP) liner, expanded polystyrene (EPS) liner, polyester webbingCertification(s): CE EN 12492, UIAAWeight: 285gHelmet Size GuideSmall: 48-58cmMedium: 53-61cm